Unlikely that Microsoft will do anything big in the hardware market; they're struggling enough with smartphones as it is, despite their best efforts (Windows Mobile is supposedly pretty awesome, and they bought Nokia).
I don't think there are any rumors of Microsoft going into this market, is there? I don't know if they have anything to bring to the table.
Bring to the table? If they actually made the table computer (the ORIGINAL Microsoft Surface), that'd be great. A computer that doesn't get in the way.