What do you think the chances are that FIFA 16 or PES 2016 will be playable on the new ATV?
Generally, the answer to all such questions will be: can you play ________ on iPhones/iPads? The guts of this and those is (very likely to be) the same, so the gameplay that we know on iDevices is very likely to be the potential of gameplay (quality) on some new

TV. I wouldn't expect anything much better than the best of what we've played on iDevices (other than whatever ongoing adoption of new iOS features like Metal brings to apps). There's always the IMO remote possibility that Apple would customize an A chip as part of dropping the "hobby" tag so that THIS immobile iDevice would have something extra and special, but I wouldn't expect that myself.
Given the massive popularity of games on iDevices, I would expect bringing the same kinds of gaming experiences as part of a revamped

TV to HDTV screens would probably be a BIG HIT (much like bringing podcasts, then video and vodcasts to iPods back in the day): a tangible, whole new application for the little box in the living room. Given that games on iDevices tend to be free, freemium but generally < $10, there's potential that Apple could beat Xbox and PS on price: both for the hardware itself AND for the total cost when you factor in buying a collection of games over time. Apple doesn't generally win on price that often but this seems like a scenario where that could actually play out.
IMO, this is the most hopeful part of the whole article...
Almost instantaneously, the Apple TV will no longer be Apple's "hobby" product.
I'd love to see Apple give the little box some
dedicated FOCUS for a while and see where it can go. I've long believed it could be HUGE for Apple the company
AND us Apple product consumers if Apple would just get after it.