What sells consoles is games, I'm not expecting to see these new consoles to Q4 2014 at the earliest.
For the new Xbox, I would expect Halo 5 to be a launch title. Might as well come out with your big gun.
I would also if I were designing it go with at least a 1Tb Hard drive, more space to make money from DLC. Espically if you want it to become a home hub.