Minor tweaks in the bookmarks UI, definitely faster when browsing bookmarks, seems more native.
I think that the overall browser is slightly more stable and quicker, but not by a huge margin. Just feels like they're tidying up to take it out of beta at I/O.
Definitely cleaner so to speak, but just not ready to be my first choice in browsers... Honestly Chrome will most likely become the stock browser for Android completely in future builds but don't hold me to that...