2015 looks pretty promising though I really doubt that Scalebound or Crackdown will make it.
Forza 6 and a Gears collection will make up for that though. Halo, Quantum Break and Tomb Raider should all be great and I think Fable Legends might surprise people. I'm not in the closed beta but I know people that are and they've has good things to say.
I know there's a decent amount of timed console exclusive indies as well. Off the top of my head there's Smite, SpeedRunners, Cuphead, Rivals of Aether, Ghost of a Tale, Lovers in a Dangerous Spacetime, Space Engineers and Goat Simulator. I'm sure there's plenty of others I'm forgetting as well. It should be a great year for indies on XB1, and all platforms for that matter.
Edit:
There's also Nero from Storm in a Teacup. I think that's fully exclusive? Not sure honestly, haven't heard a lot about it but it looks beautiful.