Gears of War: Ultimate Edition on PC releases today exclusively to the Windows 10 Store. It should have been another prominent feather in Microsoft's DirectX 12 cap. Instead, it’s one of the most disastrous PC game launches in years, and many AMD Radeon owners are advised to steer completely clear during the game’s launch window.
Update 3/1/2016 8:38 am PDT: The Coalition Community Manager PezRadar has posted a forum update indicating that all AMD cards using GCN 1.1 and GCN 1.2 are suffering problems, stating that “AMD is an important partner bringing the promise of DirectX 12 to life for gamers everywhere. We are working closely with them [...]“
The developers also confirm my suspicion about Ambient Occlusion: “There are visual issues with AMD graphics cards and the Ambient Occlusion setting, it is strongly recommended to turn this setting OFF. We are readying a fix to be deployed in the coming days.”