[HTC Amaze 4G] KnowledgeBroker:
I think I can answer a few of those for ya. And sorry this got lengthy, but it mostly answers your concerns, or at least gives you things you can possibly do about it. I am in no way trying to give any attitude, I am hoping this may be helpful :)

1. Check out post #48 and #50 in this thread, apparently if you delete the system file for stock lockscreen(free and easy with system tuner, or with titanium backup) it will default to the stock lockscreen that is part of ICS. If you want to be exactly sure what was done ask the guy who posted in #48

2. Download ICS launcher in play store, or download the trebuchet launcher which I already have shared from my dropbox(because the original threads download link was broken for a while) and push it to your system/app folder. One of those two should make you happy, both work awesomely.

3. I can't vouch for this one as easily(I haven't tried it), but the messaging app is supposed to be build from source, and again is available in play store.

4. I have no idea what the aosp look for that is, but I'll bet you that if you were willing to take a chance, you could figure out what apk handles that in the framework or whatever if you want it bad enough..

5. For calendar I'll bet you could pull it from any aosp rom running 4.0.3, and I may even try this one, it doesn't look too bad at all.. and reportedly works on any 4.0.3 rom. If you try it and it works, let me know, and vice versa.

6. There is only one ICS camera in play store, supposed to be built from source.. but I'll bet with a quick google search you can find an aosp one for 4.0.3 and put it in the system/app folder over the old one, and you'd get what you want.

7 and 8. Not sure what that is, I'll probably look into it later.

Actually, all the rest I'll bet can be pulled from a 4.0.3 rom without doing anything but replacing the htc file, but it is up to you if you want it bad enough to take the chance. With a good nandroid and s-off I'd bet the only real risk is wasting time reinstalling the leaked RUU or a nandroid.

I've literally been modifying TONS of stuff on my install(and have yet to get a single force close, but until I KNOW what is absolutely safe, I don't want to share it all), I have an odexed flashable version of the leaked ruu I've been tinkering with since the day I downloaded it- but I can't provide the level of support devs do so I will likely never put it out there.. besides, 90% of the tools that make it easier are windows only, and I don't want to even boot into my bootcamp partition to REALLY do some shiz..

This is android, with some determination and a bit of creativity, you can make this do whatever you want- and sure, it may take some time and work, but we are lucky enough to have devs willing to do that for all of us.. if we share what we each learn then we are going to reduce the drain we can be on devs to be awesome.

OH- and I wanted to add.. I absolutely HATED touchwiz. With a passion. Every aspect of it was crap. I don't really like most of sense at all EITHER, but there are FEATURES of sense which work awesomely(and are mostly replaced by googles ICS framework)- like copy/paste, as simple as it is.. with sense it was eloquent and easily functional, with samsungs crappy TW it was crappy and barely do-able.

There are tons of tiny little features that have nothing to do with htc's widgets and crappy replacement dialers and all that are actually useful, and work well.