If I were to guess I would say a single octave keyboard, maybe even with a little extra baggage and a stand to make it feel more substantial. I'm sure they, or a third party, would then release a keytar version. Pitch Shifter should also come into the mechanics, with the slider on the keytar this feature could be awesome.
I've only bought Guitar Hero 3 and Rock Band (although I've played the sequel). I'm sure there are a lot of people who have stopped playing it altogether, myself included, don't have every iteration of game and peripheral out and might take interest in this.
Remember, amongst the casuals and the hardcore live...the others...
I bet that off line, you can only have 4 instruments, but online, getting a full band should be a no brainer. Or maybe, one of the instruments can control the mic in the menus, because really, the Mic should not NEED a pad, unless played solo.
Either way, I'm sure Rock Band will be the 1st thing unveiled when E3 starts, like usual. So E3 can't come sooner.
Also, I think a full keyboard is in order. You could still make it easy by allowing several keys to be one...thing. IDK I hope it works well.
New possibilties ftw.
Hope it will be a 2 octave keyboard (but lets face it, that would be a lot to chart... then again maybe they could have different colors on the line to show the need for the higher octave) or perhaps like a midi-keyboard a press of a button would raise the octave... and since they wont have to emulate everything a good midi keyboard does, just the keys, it shouldn't cost too much. E3 better give me answers, kind of wish this news waited to drop until E3 so that I wouldn't have to sit here not having any idea of this is going to go down.
*hears crickets*
Hell it would let my son and I play the PS2 Guitar Hero games I invested good money in....
"Let's hope the full band bundles don't get even MORE expensive with a new instrument..."
Seriously? You think when they add stuff, the price will STAY THE SAME or go DOWN?
And, 70+ comments and no love for Billy Joel? I will freakin' LOVE to have "Only the Good Die Young" playable.

Also big question that might or might not have been asked already: What does the keyboard player do when there's no keyboard parts?
Required songs:
Keyboard cat's song
Mad World by Gary Jules
Safety Dance
and lets get some classical shit up in here!
I'm probably forgetting a lot of other great items in here too, but this is just top of the head stuff.

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