http://www.stormcam.org/system-portable/
Will Microsoft ever make a portable game system?
Sure they have made the incredible Xbox 360, but will they ever make a system like The Nintendo DS, Playstation Portable (PSP), or even Gameboy?
No one can know the answer to this. Any answer is just speculation.
They probably will eventually, although I highly doubt Microsoft can make anything considered portable.
Portable Fuel Cell Power System : DigInfo