Issue 1:
I'm not sure of this, but did you remove the option of having the tabs on the bottom of the content?

Would be very glad to have it back. Thanks!

Issue 2:
This issue will eventually turn into the 3.0.1 release notes. Until then it serves as an index of the key changes coming in our first patch release for v3.

Please, no comments here.

Docs

#9880: Use medium grid classes on jumbotron example

#9887: Document .show and .hide classes

#9908: Add type="submit" to Customizer compile button to prevent accidental submissions

#9915: Fix inaccurate comment in media query docs

#9917: Updated broken download link in README

#9924: Removed non-ASCII character from non-responsive example CSS

#9928, #9932: Update carousel example to work in IE10 and correctly display navbar in narrow viewports

#9931: Add ARIA role="toolbar" to elements with .btn-toolbar in docs examples

#9991: Better docs for tabbable tab markup and it's fade option

#10011: Update Grunt instruction links and wording

#10012: Add David to project readme to monitor dependency currentness

#10034: Use npm-registered recent version of grunt-html-validation instead of its git repo

#10040: Better cross referencing of default and navbar pull utilities

#10042: Updated JS Fiddle tooltip delegation example linked in docs

#10045: Use v2.3.2 release ZIP instead of master zip for downloads from old docs

#10081: Documents workaround for tooltips+popovers on disabled elements

#10082: Documents .navbar-form

#10087: Add version number to all docs pages (in the footer)

#10088: Updates accessibility docs regarding nesting heading elements

#10112: More role attributes in the docs, this time on link buttons

#10131: Corrects button group selector in JavaScript docs

#10136: Broken image link in Carousel example

#10146: Document data-ride carousel feature

#10209: Fixed broken dismissable alert example

#10215: More compressed touch icons, updates Respond.js to v1.3.0 and html5shiv.js to v3.6.2, adds bugs to package.json

#10249: Correct component name of jumbotron component in Jumbotron example

#10272: Removed unused link for nav alignment in Components page

#10277: Mention removal of navbar vertical dividers in migration docs

#10278: Change Google Maps compatibility warning to a general box-sizing warning with optional reset

#10282: Cross reference tabs and tabs plugin

#10298: Add progress bar to migration docs

#10299, #10323: Getting Started wording changes

#10316: Document .active and :active for buttons

#10324, 10338: Restore opt-in warning for tooltips and popovers

#10342: Update affix docs to better communicate plugin behavior

#10344: Update IE8-9 support section with table of specific CSS3 and HTML5 features and their support in Bootstrap

#10372: Homepage now shows two download buttons, one for our assets (CSS, JS, and fonts) and one for the source code (the entire repo)

#10382: Update Disabling responsiveness docs section for brevity

#10411: Color coded IE8-9 browser support table

#10414: Carousel now uses Glyphicons as default left/right chevron icons (text icons are still supported)

#10417: Document .hidden in the Helper classes Screen reader content section

#10419: Add nav lists to migration guide

#10453: Add additional screen reader text to button group dropdown toggles

#10459: Update Customization section in Getting started page

#10492: Account for responsive tables in panels

#10497, #10584: Fix Windows 8 and Windows Phone 8 behavior in Internet Explorer 10 and applies "bug fix" to docs

#10528: Add new About page to the docs with backstory, core team, community links, and translations

#10573: Un-hardcode tooltip arrow widths and padding for easier customization

#10591: Add modal remote option semantics change to migration docs

#10693; Include a copy of the docs license as a file in the repo

#10711: Address 100% fluid layouts in grid docs and the required padding

#10768: Fix mention of renamed .img-polaroid class in Migration docs

#10770: Rename /assets to /docs-assets to reduce confusion between /dist and docs dependencies

#10790: Disable IE compatibility mode in all docs pages and examples

#10856: Update grid docs to better explain the sizing and interactions when using multiple grid tier classes

#11013: Use CDNs for jQuery and HTML5 shiv

3318a98: Add blog link back to docs homepage

8df05b9: Remove links to navbar examples from example navbars in Theme example

022e404: Delete smaller touch icons and only include one

5d1707a: Remove unused mention of .prettyprint styles from code.less (we no longer use that plugin and the class is undocumented, so we're nuking it)

6e06489: Remove unnecessary left and right properties from .modal-dialog since we use margin to center the modal

19db69c: Add Linux Firefox to supported browsers list

99b3515: update outdated JSFiddle example

Bug fixes and changes

#9855: Partial fix for open modal content shifting: removed all margin settings to prevent some of the content shifting. Still needs JS love to detect scrollbars and adjust content accordingly (will address in v3.0.2).

#9877: Add improved .active state to navbar nav in theme

#9879: Add hover state (move gradient up 15px) to theme buttons]

#9909: Add @component-active-color variable to complement @component-active-bg (and apply it to dropdowns, nav pills, and list group items)

#9964: Add fonts directory to bower.json main files list

#9968: Simplify striped progress bar mixin to remove unused color

#9969: Add support for output element by styling it more like our .form-control

#9973: Removed unnecessary -ms-linear-gradient prefix

#9981: Account for hover and focus states on pagination disabled items

#9989: Set monospace font-family on <kbd> and <samp> to match browser defaults

#9999: Make .table-hover styling apply to <th> within contextual table rows too

#10013: Position carousel left and right controls from the left and right, respectively

#10014, #10406: Update grid to use width on .containers instead of max-width as IE8 doesn't fully support box-sizing: border-box when combined with min/max width/height

#10022: Add width: 1em; to all empty Glyphicons to prevent loading flicker

#10024: Use negative margin to fix the border between button and input in input groups

#10025: Add additional transform mixins

#10057: Autohiding scrollbars in responsive tables for Windows Phone 8

#10059: Add .transition-property() mixin

#10079: Native-style scrolling in responsive tables for iOS

#10101, #10541, #10565: Generate CSS file banners via Gruntfile

#10111: Use different colors for dropdown link hover and active states

#10115: Default carousel controls and Glyphicon controls should behave the same on small devices and up

#10126: Update responsive test cases to properly highlight hidden class examples

#10153: Restore @headings-color variable

#10154: Add .small to pair with our heading classes (e.g., h1 and .h1)

#10164: Document .center-block() mixin and update CSS to include it as a class

#10169: Remove old @navbar-inverse-search-* variables

#10223: Add @input-color to .input-group-addon to match the form controls

#10227: Use correct max-width on Offcanvas example media query and add overflow-x: hidden to prevent scrollbar on narrow devices

#10232: Scope .table styles to immediate thead, tbody, and tfoot elements

#10245: Add @breadcrumb-separator variable for customizing breadcrumbs

#10246: Use correct variable for link hover color in Customizer

#10256: Use @navbar-default-brand-color within the @navbar-default-brand-hover-color variable

#10257: Remove filter on navbars in theme.less so that dropdowns can be triggered in IE<10

#10265: Scope background-image reset to Bootstrap buttons and form controls only to avoid Android Firefox bug

#10336: Replace non-ASCII dash in LESS source file

#10341: Don't change border color on contextual table classes

#10399: Add hover styles to text emphasis classes

#10407: Add line-height to progress bar for proper text alignment within

#10436: Use @screen-sm variable instead of hardcoded pixel value in type.less

#10484: Allow for .table-bordered in panels by removing side and bottom margins

#10516: Use auto positioning for dropdowns in justified nav to fix Firefox rendering

#10521: Only remove bottom-border from last row of cells in tbody and tfoot within responsive tables

#10522: Enable use of form validation class on .radio, .checkbox, .radio-inline, and .checkbox-inline

#10526: Remove custom background on responsive tables and set it in the docs where it should've been originally

#10560: Remove display: block; from address element since browsers set that to start

#10590: Mention required jQuery version in docs

#10601: Use overflow-y: auto; for .navbar-collapse instead of visible to better enable scrolling on Android 4.x devices (see issue for more details on support and gotchas)

#10620: Remove filter on buttons for IE9 in theme.less due to bleed-through with rounded corners (matches behavior and style of Bootstrap 2.x)

#10641: Remove unused .accordion-toggle class from docs example

#10656: Inherit link and caret colors for textual dropdowns in panel headers

#10694: Remove unnecessary content property from .caret

#10695: Ensure carets in .nav-pills dropdown links inherit active color

#10729: Removed the unnecessary override and the !important from .wrap in the sticky footer examples

#10755: Don't remove quotes around q element by default

#10778: Use newly-updated Glyphicons to workaround old Android WebKit bug

#10763: Update html5shiv to v3.7.0

#10863: Fix check for presence of jQuery

#10893: Remove comma separating the color and the color-stop in -webkit-linear-gradient in #gradient > .vertical mixin

#10927: Scope padding-top on .form-control-static to horizontal forms only

#10949: Use variable for jumbotron font-size instead of hard-coded value

#10959: Round .lead font-size to nearest whole pixel

#10997: Move .hidden from responsive utilities to utilities (where it belongs, especially on account of deprecated .hide per #10769)

#11050: Restore grid mixins

#11126: Remove box-shadow from .btn-link.dropdown-toggle

#11127: .navbar-fixed-bottom should have a top border, not a bottom border

#11139: Add position: relative; to .modal-dialog so that the z-index takes effect

#11151: Remove rogue H5BP .ir class from print styles

#11186: Add background-color hacks so that clicking carousel indicators in IE8-9 works as intended

#11188: Refactor z-index on navbars. Removes the default z-index: 1000; and instead only applies it to static-top, fixed-top, and fixed-bottom. Also fixes up the broken default navbar example's fubared padding.

#11206: Remove padding-left from first list item within .list-inline

#11244: Adds .animation() mixin to replace .progress-bar's regular CSS animation properties (and drops the -moz, -ms, and -o prefies as they are not needed per http://caniuse.com/#feat=css-animation).

#11248: Apply background-color: #fff; to selects in print styles to fix Chrome bug

291a23a: Audited Customizer variables section and rearranged content

Deprecated

#9963, #10567: Deprecate @screen-* classes for @screen-*-min to better match the @screen-*-max variables and provide more context to their actual uses.

#10005: Finish removing uses of @screen-{device} variables by deprecating them for @screen-*-min wherever possible.

#10100: Deprecate .hide-text mixin for .text-hide. This matches our class-mixin strategy elsewhere (e.g., .clearfix) and ensures the class and mixin use the same name to avoid confusion.

#10125: Deprecate inconsistent container variables for new @container-{screen-size} variables (e.g., use @container-sm instead of @container-tablet)

#10769: Deprecate .hide for .hidden so we don't duplicate functionality.

For a complete list of changes, see the 3.0.1 milestone.