I could be wrong about the 22nd. At this point I'm only speculating. Most of my emphasis centers around the applesauce convention June 7-11 that was just announced. I can't help but think that would be a terrible release date for the EVO since most of the media attention at that time will center around Apple - not Sprint. I have not been following the BB deal and didn't know about a May 23rd release date.
Right now, I have to believe Sprint's emphasis has to center around their flagship, the EVO 4G and that's what they need to concentrate on. May 22nd seems like the perfect release date to me, but that's just me. One thing for sure, we'll learn more from the NYC event on the 12th. Until they tell me different, I'm still sticking with May 22nd.
I've been fine with June 6th or June 13th, but now with the the applesauce convention, I think it would be a disaster to release at that time. Yes, Sprint is going to have to push a little harder, but it's possible and it's only 2 weeks earlier. May 22nd would certainly make a lot more sense if they can pull it together.