I kinda somehow doubt a different form factor. Not with all those hard drives out there. I'd be seriously pissed having bought an extra already, seriously looking at the new one now, and for what? Them to release a new console that eventually I know ill have to buy when mine bites it? Not comparable with hard drives ive bought? Seriously lame.
They just need to keep the same design, lighten the box, and make smaller cores.