I just quickly checked some sites that I have managed or optimized before, 80% of them received a higher PR score on most of the web pages, 15% remains at the same level, and 5% got a step back.
This is the first major Google PR update after the Panda update of their natural search algorithm. The last PR update before this one was on Jan 20, 2011. It seems like Google is catching up with their PR update frequency much better than last year.
How is your site perform?