New games availability?

How do new games for Cloud get added to Xbplay? The newest game I see is Still wakes the Deep, but there are several new releases after that, that I can't find (yet). Does the developer of XBPlay have to add these manually? If that's the case, this means quite a big risk for whenever the dev decides to abandon the project.

I would think there would be a possibility to have an auto-detect for new games on the Cloud service or something.