The advertising revenue should be significant, but not so much the microtransactions...
What would be a good idea is if they integrated the whole of the PS Store in there and also started selling physical items for shipping.
PSN ID: T_Gears
End of 2009 ltd sales:
Wii = 67-68m
X360 = 38-39m
PS3 = 34-35m
Prediction: The PS3 will surpass the 360 on weekly sales after it drops to $299 on all regular weeks (no big releases).