What's interesting is that the PS4 has 5 SKUs in the top 20 to Xbox's one ( Get it. One. ). I bet those 5 put together outsell the Xbox by at least 2x-3x. Of course, I think Gamestop, which probably receives more preorders than Amazon, is also very telling. The PS4 has 6 SKUs in the top 10, while Xbox only has one at #8. Heck, even the DS4 is outselling the Xbox One by 4 spots.
Edit: Oh, and COD: Ghosts on 360 is even beating the top One SKU.