https://play.google.com/store/apps/details?id=org.citra.citra_emu&hl=en_US
Previous beta releases won't load games on Shield. It needs to be sideloaded and doesn't have a Leanback launcher right now. Performance isn't great and I can't find any option to hide on-screen controls even after remapping all controls to my controller. USB mouse works fine as 3DS stylus. A good start at least.
Aw
Yeah... tried yesterday and i'm happy with the performance. You can hide input, editing the config.ini