Well, I couldn't eve begin to have an accurate guess at this.
I do think Xbox One may just edge out the PS4. I'm not sure Smash Bros is going to have the Wii U bump people wanted. 3DS will keep chugging along, I think it'll get a nice holiday boost. Vita will be non existent as usual.
Guess figures:
XB1 - 1.100,000
PS4 - 950,000
Wi U - 350,000
3DS - 750,000
Vita - 40,000