I think you can cross "Quantum Break" off the list, as it may be a casualty of the firings today...no "Xbox Entertainment Division"=no tie in TV show like they had planned. When asked directly if it was affected, MS wouldn't comment.
Sunset Overhype isn't going to do it either. While it DOES look interesting, it does NOT look like a game with any kind of pull to drive people to buy the hardware it runs on.
Halo? Halo fans already own an Xbox. Halo FIVE might move consoles, but Halo 1-4? Nope.
All of that being said, I wonder how many more months Xbox can afford to lose before shareholders (or Nadella himself) lose patience and kill it off completely? I can't imagine them plugging away at a money losing console forever, especially when there is NO HOPE of them EVER taking the #1 spot this gen!