I'm going to take the long view and say next year. Apple is very Apple centric so I can't see them making a developer based announcement for anyone other than

I'm going to take the long view and say next year. Apple is very Apple centric so I can't see them making a developer based announcement for anyone other than Apple developers. Based on that I'd guess WWDC in June 2011. Plus they're selling the new iPhone with FaceTime right now so they wouldn't want to give a company like Google the chance to quickly implement it. WWDC 2011 is also when they'll probably announce the next gen. iPhone which presumably will have new features to focus their marketing on.