Nes, Snes, Genesis, a couple more. I may have to keep an eye out for it before there's a DMCA takedown.
Emulators aren't illegal so I doubt it'd be taken down. Emulators have been available on the android, apple and windows phone store for quite a while now. Roms are what are illegal.
True but I doubt Nintendo will stand by with Xbox having a means to play thier games. Especially ones they are selling on Eshop The Emulator will be most likely what they'll go after.
...SNES? ...I hope this somehow means I could someway try to possibly maybe perhaps play Genealogy of the Holy War... Maybe
Yeah, this was never going to last. Nintendo is still charging $5-$10 per game to emulate these things on their systems. Even if emulators aren't illegal, allowing it on the system is just asking for trouble.