Bashiok revealed the Diablo 3 demo featuring the Monk class will be playable at PAX 2009 through September 4-6 in Seattle, Washington. Starcraft II: Wings of Liberty single player will be playable too, so start packing and get ready for a fun weekend.

Blizzard Quote:
Blizzard Entertainment will once again be representing in full force at the 2009 Penny Arcade Expo, taking place this weekend, September 4-6 in Seattle, Washington. PAX attendees will have access to playable versions of Diablo III (including the recently announced Monk class), the earth-shattering World of Warcraft: Cataclysm expansion, and the engrossing StarCraft II single-player campaign. Community managers will also be in attendance to chat with attendees about the past, present, and future of Blizzard Entertainment games. We hope to see you there!

http://www.paxsite.com