So far I've only had the upgrade for 12 hours, but here's what I noticed;
The vibration on pressing a key on the keyboard is much more tame. Still very noticeable, but it won't shake your whole hand like it used to. Keyboard itself doesn't seem to have changed. I can still type very fast with it and it seems to only be limited by the speed that I can press keys.
The notification bar pulls down much smoother. In fact it is perfectly smooth, they way it should have been from the beginning.
Upgrading caused the Apps Organizer program to crash. Rebooting didn't fix it, but strangely after opening the program and sending an email to the developer it fixed itself. Right after I sent the email. Weird.
The lock screen looks different, but the same exact motion still unlocks the phone.
Not sure if it did this before, but the screen dims to a low level after 8 seconds of non-use. I use screebl, so by non-use I mean that the phone is sitting down flat (never when I'm reading something). I have it set to turn the screen off at 15 seconds. It is still readable dim and if you press anything it brightens right back up. It may have done this before update, or it may be a screebl update. Not sure, but I didn't notice it until after I updated.
New black power widget looks much better on its own, but the white power widget fit my theme much better. Bah Humbug.