Great idea by Blizzard, but I fear they're opening their forums to a flamefest of "DON'T DO THIS BLIZZ! THIS SUCKS!!" etc. etc. While good for killing possible bugs, most of the community QQing about everything doesn't have the slightest clue about balance.
They've done this with WoW forever. It's an incredibly smart idea. Blizzard gets free (or even negative cost..? whatever that would be called) beta testing and people get to try out the patches before they're live.
dgingerianother example of Blizzard's excellent customer service. I wish I could work for these guys.
Yeah, Blizzard gets free QA personnel. Though it is understandable today that the scale and complexity of games today (especially on multiplayer games) that it's impossible to get the majority of these bugs.