Last Tinker canceled for Xbox One due to low PS4 sales and a smaller install base:
http://www.ign.com/articles/2014/10/02/the-last-tinker-cancelled-for-xbox-one
What's interesting is that it was announced for Xbone before PS4, but somehow the PS4 version got out first, and now the Xbone version isn't coming out at all.
Always sad (to most people) when studios are struggling and have low sales, but The Last Tinker doesn't sound like it lived up to the potential it had. Apparently they when the lazy route on the platforming (making it AC-like instead of normal 3D platforming) and I think $20 is asking a bit much for something like that in this day (though apparently it's on sale for $15 for PS+ which I had no idea, wonder if it's one of those "permanent" sales).