NEW:
Safari
"Tabbed" web pages are now truly limited to eight. Previously, you could have more than eight open, because you could open more from webclips on your homescreen, and the number of "tabs" would not be displayed whenever there were more than eight. Now when you have eight open and try to open a ninth from a webclip, it replaces the first (leftmost). Try another one and it will replace the second, etc. More importantly, however, the eight you do have are real, in that they stay cashed in memory, so you can jump around the eight "tabs" without seeing the blank white pages from no-longer-cashed sights. This is, IMHO, exactly as it should be (and why would anyone need more than 8 web pages open on their phone?).
MAYBE NEW:
Apps
This may or may not be new, but when you go to read an app's comments in the add store, at the top there is a button to write your own review. When you click it, you will also have an area to rate the app with stars, right above the text editing area. I think this is new, but I'm not sure.