Yep I had the same problem. Win 10, 970, 4690k and 16gb of RAM. Apparently my system isn't up to snuff for Gears of War.
At this point I'm done being angry at MS' perceptible contempt for PC gaming and their incompetence at delivering good products. That's because both of these approaches will combine to kill games as UWAs and all of our worries about them destroying PC gaming will be over. At their current light-speed pace of stupidity, it shouldn't take too long either.
It's hard to say with this game, since I don't know if they had been standing still long enough for the reconstruction thing to kick in, but there's no way that's 1440p, but there's no way it's 720p either, with the detail on Jack's zipper. You can see the individual teeth. I'm sure that detail would be lost at 720p.