Telltale games says the Windows Store offers wider reach than Steam, will port full catalogue there.

[vivster]

SWORDF1SH said:
But all of Steam's active users are on Steam specifically to play game. How many can be said for Windows?

But guess how many non steam users know that they need to have a client to play games. When the adoption of Windows 10 increases they will be able to reach millions who will just stumble upon the games via Windows. There are a lot of people who want to play but don't know about or are intimidated by steam.

There is certainly no downside to also release your games on Window's store.