I'd love to see it on PS Vita. It was my most played game last year. Torchlight 2 would also be nice, but I'd rather have D3.
They could use touch controls for skill and just put them at the right and left sides of the screen. That way they'd be within reach of players with smaller hands. Just put a little space in between each skill, so you aren't accidentally hitting the wrong one. Then again if they are getting it to work good on the PS3 controller, they might only need to put a couple commands on the touchscreen. Whatever is on the R2/L2 buttons.
Anyway, I'd love it. I've watched youtube videos of it on my Vita and it looks great on the OLED screen. Bring it Blizzard.