First I noticed at the top, instead of the "word balloon" icon for telling you if you have responses, that seems replaced my my personal icon.
Then I noticed that the icons for individuals posting next to each thread looked a little different (such as the W for waytools). May also be that even the pictures look a little clearer, but I may not be able to trust my eyes. Finally, the icon for the first poster in a thread has a circle around it I don't recall - though some don't seem to show it. Maybe there are other changes I haven't seen yet.