I don't think you'll ever see an NDS emulator on the N9. The CPU requirements are just not there. There was a working NDS emulator on the N900 and it only ran at like 1 frame every 5 seconds. The N9 CPU is not that much better so it would be pretty awful.

Elemental has already said he's stopped work on this iteration of Emumaster to work on a cross platform version, so you should be able to look for ward to it on Windows 8 at least.