So far for February,
PS4 (W/japan): 737,579
Xbox One: 158,471
For comparisons sake (PS3/360 first February)
360: 330,928
PS3: 240,586
Bet with Adamblaziken:
I bet that on launch the Nintendo Switch will have no built in in-game voice chat. He bets that it will. The winner gets six months of avatar control over the other user.