Writing in his blog, Larry Hyrb (aka Major Nelson), explained that xCloud has had an update on Android to allow better discoverability of games on xCloud. This is due to the feedback from the community and with this update, 5 games will have their trailers in the main menu so you will be able to see games that are available on xCloud.
When you open up the Xbox Game Streaming preview app, you’ll see a set of trailers for five different games you can swipe through at your leisure. As you watch the trailer, the game will load in the background and if a particular game catches your eye, you can jump in and play or keep searching for something else.
We’ll continue to mix in new trailers to keep things fresh and to help you try something new.
This update will be useful going forward when more games get added to the service.