Well, they finally announced it.
If they port the PS2 version:
They can get away with it. If you need DLC or Character creation, you have the X360/PS3 version that's been out for months. I'd still be pissed off though.
If they port the X360/PS3 version:
YAAAAAAAAAAAY! I guess they'll put DLC on WiiWare. Problem solved.
I wonder if Nintendo set up a "standard guitar interface" like Microsoft did that avoided the guitar compatibility issues in the PS3 version. Time will tell...
There is no such thing as a console war. This is the first step to game design.