Ike, you seem new. I've been lurking on this BB for a while, so I'll fill you in on some things. I'm by no means a BB expert, but I'll give things a shot.
There are people pushing (or whining, depending on your POV) to get the B-29A into AH. Do a BB search if you're interested in reading the thread. The general drift of things also seems to be that an A-bomb would be too unbalancing for the MA. But I agree that the 29 would be cool to see someday.
These are all just BB discussions, meaning there's been no official word or even rumors from HTC (that i know of).
Don't forget that the AH planeset is far from complete, and constantly in development. I don't think HTC would leave the B-29 out, so I hope it's just a matter of when they get around to it. I think there's a lot of higher-priority gameplay stuff out there first.
As for the non-WWII planes... i vote no.