Augluae on 18 December 2013
Bear in mind that
1. PS4 sold 2,5 millions this far, and the Holiday period has not even passed.
2. There's 1,8M people on the waiting list just in the US, just at Gamestop
3. For those a tempted by the PS4 but not fan/gamer enough to have rushed on the release, there's another big period coming (especially in Europe and Japan) and this is February.
