timppu: 1. Support for "legacy Windows components", ie. the ability to run Win32 applications and games. This is more about how backwards compatible the future Windows versions will be, can we still play our old GOG (and Steam) games on them. In the best case it could be like MS-DOS nowadays: we can run old MS-DOS games just fine on modern PCs, by using DOSBox, without the need of modern Windows to actually support MS-DOS. The best of both worlds, hopefully we get something like that for Win32 applications as well, being able to run them fine on future Windows versions, without those Windows having to directly support Win32 with legacy components.
That would be where virtualization comes in, how well that performs with demanding games is anyone's guess. Most likley though it won't perform as well as it would natively.
timppu: 2. Whatever the new Windows standard will be, is it called UWP or whatever... does Microsoft allow competition between stores, or will you be able to get UWP applications/games only from the Windows Store? This is a more important question for competing stores like Steam, GOG, Origin and UPlay, ie. can they directly compete with the Windows Store with selling UWP(?) applications? Can some game publisher making an UWP game decide to sell it through e.g. Steam or GOG, instead of Windows Store?
If it is just as simple for anyone to sell their own UWP applications through their own store or web page, without having to sell it through the Windows Store, then I guess the competing PC stores can still live on.
I don't know how it is, I was at some point under the impression that that the modern Windows applications (UWP?) are pretty much locked to Windows Store, ie. you can only obtain and purchase them through it, but I seem to recall someone suggesting earlier that is not the case, they can be obtained also outside of Windows Store.
From what I have read, at-least in regards to Windows 10 S no apps will run outside of the store even if they are UWP. All apps on Windows 10 S have to be signed by the store in-order to run. So if "S mode" has the same restriction then it would be harder to have competition.
Now it's possible Steam / GOG Galaxy could have some kind of UWP version placed in the MS store that support UWP games. I don't see why MS wouldn't allow that if they are allowing (or working with) Apple to release a UWP version of iTunes. From what I read you only have to pay MS if you use the built in store payment methods, if you build your own then you don't have to pay MS if you sell something via an app in the store.
Now if it is in their best interest to do that is another matter, they would be helping MS push their own store and UWP more than themselves. It may be better to look to a more open platform like Linux.
But yes you can technically release a UWP version outside of the store on any store you want... but that doesn't mean MS will allow it to function on all versions of Windows.
amok: the worst threat to gOg is gOg
Sad but probably true.