So it appears that we might finally know what form this hardware will take. Eurogamer are claiming a number of sources have revealed to them that the system will be a handheld first which will then connect to the TV for play at home. The system will be cartridge based with power provided by the Tegra mobile chip that Nvidia make.
http://www.eurogamer.net/articles/2016- ... ontrollers
I certainly didn't see the priorities being this way around, so far everything seemed to point towards a home console that you could then take on the move. I suppose though that this way around you get around the issue of games looking worse on the move or having a really expensive system which can do both or a system split into two parts.