Moscone Center has a "Corporate Meeting" scheduled for June 5 - June 9, 2011 which looks to be the only period long enough to fit in Apple's annual WWDC (World Wide Developers Conference) event where iPhone 5 and the final version of iOS 5 would likely be announced. Of course there's always the possibility of misdirection or last-minute shuffling so until Apple opens up registration we won't know for sure. Still, it's something.
Given the typical keynote structure, we'd then be looking for Steve Jobs (or an assortment of Apple execs including Tim Cook, Phil Schiller, Scott Forstall, etc.) to take the stage on Monday, June 6, a year and a day following the iPhone 4 announcement in 2010.
Yeah, we haven't even gotten an iPad 2 announcement or iOS 5 beta preview yet, but we're still getting excited!