Seems like an ideal scenario that would bring a lot of new added value to AppleTV. I'm with you in hoping they show up on AppleTV too.
In the meantime, anyone with a PC and a Nvidia graphics card should check out the free AppleTV
Moonlight app, which effectively streams anything on PC through AppleTV to TV. One can do the emulation and AAA galore gaming on the PC- even in some distant room on the network- but enjoy it through AppleTV that way (very much like streaming a movie from a hard drive stored elsewhere in the home). Some great games I've opted to purchase in PC stores have no problem at all playing through AppleTV on my TV. PCs
already have
ALL of the emulators and just about all of the AAA games too. It "just works" very, very well.