Why would MS release win32 apps if the games are published by them? Of course they will release UWP in their own store, they would be stupid not to. UWP being win32 in it's base means win32 is not gonna get destroyed nor is it going anywhere. Exe files are still there you simply cannot mess with em that easily. They had plans on giving some leeway so there would be easier modding and so forth. Exclusive fullscreen also was in their plans. Will see how it pans out, but they are trying to unify xbox and pc which means gaming is in their plans currently. It gives nice revenue in software and microtransactions.