User blog comment:Bovell/UPDATE: Battlefield 3 demo not yet confirmed/@comment-3037252-20110421192213/@comment-28584497-20110421193350

I'd say it's quite likely that it'll be released at the same time for the different platforms... if worst comes to worst, it'll be released to the PC first and consoles second. But EA and the rest have usually been pretty nice when it comes to that sort of thing.

As for weapon balance, no. The weapons in BC2 are heavily balanced, minus the extremely underpowered or only marginally different weaponry (M60/F2000 and bolt-action-rifles in BC2)