MS also hired the GoW series producer, Rob Fergusson.
The thing we showed at E3 last year [Black Tusks trailer], it was something that was done in Unreal and more of a concept piece.
From their site
I have to say that I'm disappointed that Black Tusk isn't working on a new IP. I'm glad the GoW franchise is getting a reboot, but they need to do exactly what we've been asking of 343 if they want the series to become "big" again.