Konami just updated its DDR Facebook page with the announcement that it'll be showing off DDR for the PS3 on August 12th in LA...

http://www.facebook.com/dancedancerevolution

"DanceDanceRevolution  Yes, DanceDanceRevolution fans, it’s true—we’re bringing DDR to the PS3! And we’re bringing YOU to the launch party! Thursday evening, August 12, in LA. Join us in person, on Twitter, or on Facebook for exclusive, interactive, fan-friendly, multiplayer Music & Motion fun. Stay tuned for more exciting details..."

I'm interested in the Motion fun part, probably means it has move support.