A few things I would like to see:
* PS3 Controllers - There is already android hacks for these, so I'm sure someone will get this going
* HID USB controllers, Keyboard and mouse - These should be a given, Doesn't android already support these?
* Steering wheels
* Cases, Someone needs to print us some cases, I'd pay damn good money for you to make my Ouya look like a mini-NES
* Internal storage - I want lots of it
* Emulators - Like this isn't going to happen anyway....
* GPIO - Have they left any of these available to tap into? we could hook up some cool crap with this, IR, Serial Display etc