So much bad info here...
YES XB instruments will need an adapter to work for the XBO....from what has been written, it will be a 1 adapter works for all....so think like a USB hub type deal for all your instruments.
No word yet on ION or e-drum support OR if you have wireless mics from another game like I do
Also, this 150 DLC incompatibility is so overblown its not even funny.....its Beatles which has never worked in RB and then its the RB3 disc which hasn't been exported because DUH, there wasnt another game after RB3 so no export was necessary to now ---- IOW, theyre currently working on that being a possibility....and the other is if you have RB Network stuff because there is currently no support in the current gen consoles for such a thing....
So again, completely overblown....
Any other DLC you had will be available and move over, provided its tied to your account, you are going to the next gen of the same system, and you made sure to export the disc songs when you had the chance (RB1, RB2. Lego, Green Day, etc)
Also, there will be a digital download as well as a standalone disc copy for those of us like myself who already have legacy instruments and just don't feel like buying anything new.
Hope this all makes more sense and gets some more buyers