It's hard to tell how they decide what games make the "Play Anywhere" cut. Surely the MS exclusives will make it but I see ARK on the list as well.Didn't I hear something about all xbox one titles working on windows 10?
Current list - http://au.ign.com/wikis/xbox-one/Xbox_Play_Anywhere
Interesting concept but we'll have to see how it pans out. If it was all games it would be a gamechanger but if it was MS exclusives I'd barely notice. It does fit nicely with the apparent resurgence of co-op but many titles are now talking cross-platform play which makes it a bit redundant.
Crim, don't expect much SoD in your 7DtD beyond the 'scavenge in a zombie apocalypse' premise. You can definitely tunnel too, underground is probably the safest place to be.
DJ - Totes, and that's just the first alarm bell of many. The phrase that first springs to mind is "unrealistically ambitious". I'll be watching it though, it will be pretty special on the off chance they make it work.