This sounds different though as it seems to not require any extra effort on the part of the original developers/publishers to make it playable, they just need to say it's okay. I think we just need to hear more about the process, because it could be cool to have if its as open game wise as it was made out to be. Would make things easier than having to bring out the 360 if I had an Xbone, which I don't plan to get anytime soon.
Going through everything they announced and leaving off the multiplatform stuff (yes-including Rise of Tomb Raider), there are a few games that interest me. Rare Replay is probably the most enticing, but in reality it's a $30 compilation of games I (mostly) already own. I was stoked for Sea of Thieves until I started seeing more about it being an MMO. Don't have time for those.
Hololens looks interesting, but nothing I would invest major dollars into. The fact that they didn't give a release date or any indication on price says it's going to be A) Awhile before it comes out and B) Pretty damn expensive. I'm also not a huge fan of Minecraft so while the implications of what they were doing are cool, I have no interest in the game they showed.
Recore looks pretty cool and the Elite controller looks nifty. I'm sure it will be $100 retail though which will limit it's appeal, much like expensive force feedback wheels are niche.
At this point and having played these series to death, I really have no more interest in Gears, Fable or Forza. I love the lore of Halo and the Bungie games, but Halo 4 left a really bad taste in my mouth and from what I have seen of Halo 5, it looks to follow it's predecessor's footsteps.