I have it from a pretty reliable source that AT&T is shooting for a June 24th launch of OS 4.5. I don't know the final version number they will be releasing but I'm guessing 4.5.0.42. 4.5.0.37 is preloaded on the 8120 from Rogers so it's possible that could be their version, too.

I have nothing in writing or any press release to back this up but thought I'd pass along the info.