This is what you guys are going to get. Take it or leave it.
There will be Durango (all the leaks we have currently pertain to this console). It is MS's next gen gaming console competing with PS4 and Wii U.
Possibly, there will be XboxTV (basically low-power tablet/cellphone guts in a box for media streaming and xbla style games). It could be a MS's answer to AppleTV, etc.
Finally, there will be a refresh of the Xbox 360 (a la PS2 super slim). This will enable MS to continue to capitalize on last gen gaming in the budget-minded audience space.
All 3 will likely include some form of Kinect and some variety of the Metro interface by way of a custom version of W8 or WRT (depending on the device).
I would make a serious bet on the above happening.
A dual APU console, while interesting, does not remotely make any bit of business sense. The whole idea of a system on a chip is to take advantage of a reduction of system complexity and power utilization in every aspect of system design from power supply to box size to single, simplified cooling solution.