S.Peelman on 01 January 2013
Even though I'm pulling these numbers out of my ***, I'm going to take a shot at this. Why not, too bad we have to wait for a year to see who's correct though 
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3DS: 15.1m
WiiU: 10.6m
PS3: 9.8m
X360: 8.1m
PSV: 5.0m
Wii: 4.2m
X720: 2.8m
DS: 2.6m
PSP: 1.9m
PS2: 1.0m
I think PS4 will be released early 2014, XBox 720 just before holiday 2013 like WiiU did, PS2 will be discontinued worldwide and sells it's final shipment.
Essay Pro