> Also why not just make a mobile or tablet that can plug in to a TV, with wireless controllers?
The entire point of this thing is to make a "console", not a tablet.
Most tablets already have a HDMI out so you can plug it into a TV, and there are ways to have a wireless controller with tablets.
It appears to me that this is just a tablet without a screen. From what I gather from their FAQ, development on this is identical to developing for android tablets and any existing android app will work with it. The only tweaks needed for existing apps would be to provide a way to control them with the controller instead of a touchpad. Their specs do say that the controller has a touchpad, but I don't think a touchpad without a display is very usable.
On the other hand if this console is made bulkier than a tablet then it could be made fan cooled which in turn would allow overclocking with less risk of overheating.