I dont think they would take the extra features out like the slots and wifi.If Sony were to release a 40GB it wouldnt be good it would be better to either stick with the 60GB and lower the price to $399 or lower the price of the 80GB to $399 then the sales will roll in.
End of 2014 Hardware Predictions (03/03/14)
PlayStation 4: 12-15million
Xbox One: 7-10 million
Wii U: 8-9 million (Changed 01/04/2014 from 7-9 --> 8-9 million)