I thought I remember reading one of the MS reps saying that Gears needed some time to regroup or something like that.
Ah, here it is: http://www.oxm.co.uk/56421/gears-of-war-xbox-one-will-take-some-time-says-microsoft/
No need to overreact to this rumor. This is directly from someone meaningful and it's clear that they are in no hurry to Gear up again.