A couple guesses ,
iPhone nano ...anyone?
I'm with the tablet mac maybe 3g maybe wimax Internet device / with back to mac & screen sharing
that seems like a total hit ! Every mac pro owner would probaly get one !
power of the big boy on the road ... Everywhere !

New cinema displays ? Maybe .. I wish..
and I don't think you'll see a touch cinema display
before a touch iMac....
it would be easier to implement being a all in one