This is interesting
Google search "Beaglebone black chipsee"
Beaglebone Black ($50) + Chipsee touchscreen ($150) + Wifi card = combo that can run compact versions of Windows (XP,7,8?). For $200 you'd have a bare bones computer that could download STLs, slice them and host the printer without an SD card or the need for octoprint. In the near future I'll have a demo of this running an SD3 on RAMPS.
Be aware that its still only a 1ghz ARM processor with 512mb of RAM.. not exactly going to be a trail blazer in terms of slicing and dicing. This has been the limitations for most other solutions - you can already happily run many frontends under linux - including repetier-host.... Its the ability to slice inside a few minutes thats the limitation. Even quad-core ghz+ SoC's struggle...
Personally, I'd be more keen on seeing some cool would lashup with a replicape ; ( http://beagleboard.org/project/Replicape/ ) with the LCD... this way you can actually still do away with not only a host computer, but also the controller... and it'll be just as fast/flow as lumbering around WinCE (which isn't needed for repetier-host.... you can already run it under linux 
)