Desktop CPUs are something like 10 times faster than the typical ARM mobile CPU. Plus a desktop would run the higher optimized JVM instead of Dalvik. I'm sure it is challenging to get Minecraft to run at a playable level of performance on mobile hardware, let alone drive HD resolutions.
> I'm sure it is challenging to get Minecraft to run at a playable level of performance on mobile hardware, let alone drive HD resolutions.
While there's a lot of Minecraft that's certainly CPU-bound, rendering at higher resolutions has next to nothing to do with CPU speed. The bulk of your rendering work is done by the GPU, and the GPU in Ouya is more than capable of rendering Minecraft at HD resolutions.
