Change "favorites" to "bookmarks".  This is less confusing terminology and more widely-used across the Web.
Publish-to-spam status change fixes.
More publish-to-spam fixes for replies.
More fixes related to post statuses.
Consolidate some of the post status transition code into its own functions.
Add topic open/close functionality.
Trash handling.
Close status for forums.
Distinguish between main forum queries and sub-forum queries by adding a mb_sub_forum_query() function.
Initialize sub-forum query.
Add in custom post row actions.  They don't work yet, just links.
Clean up edit posts pages in the admin.
Template query wrappers.
Remove "views" functionality. This should be a separate plugin.
Remove views functionality from functions-rewrite.php.
remove the Single Term library since we're no longer using it.
Consolidate topic + reply query into a single query function so that theme devs don't need multiple loops on single topic pages.
Save forum ID for replies (note: still need to do this on creation).
Even more post status stuff.  Getting closer.