It might be waiting for MeeGo to see how they would do it.

Once they solve the age old dilemma:
(cross compatability, decent speed, limited/no fragmentation, with tools to make easy programs and bypass the political bs)
... Win 8 could be the new windows for 3 consecutive terms (ie Win9 and Win10 could potentially be minor upgrades).

I hope to see Dual 2GHz Cortex A9 (28nm) silicon with SGX543MP8 GPU matched with 2GB RAM, 256GB SSD, beautiful displays and plethora of sub-units (dsp, usbhost, hdmi out, bluray, phone, 3G, gps, compass, light detector, cameras etc) ... using (full desktop) Windows!