Yes, I got into the Mists of Pandaria beta this past weekend. This is Part 1 of the Pandaren starting area. I decided try out the new monk class at the same time. First impressions: Pandaren are cool (and very bouncy) and Monks are fun to play so far (I'd like to try out a level 80 or higher monk). I've encountered a few problems so far (the biggest being lag) but they should be ironed out by the time the game launches sometime this year. After all that's what the beta is for, to find these problems.
I'll be releasing the entire Pandaren starting zone over the next week or so. I'm trying to stick to a schedule of 1 video a day for this. We'll see how that goes.