Google announced that Google Now on Android can integrate with some of your favorite Android Apps. For example, instead of just showing you traffic alerts from Google Maps, or weather, or your flight times – it can now show you rooms available for rental from Airbnb or news cards from The Guardian and much more.
Google has integrated Google Now with 30+ developer apps and plans on adding more over time. The list can be found here and includes popular apps like Shazam, Duolingo, TripAdvisor, Ford and many, many more.
Here is a picture of how the Airbnb data shows in a Google Now card:
You can check out how these cards work on this sample site.
If you have an app that you want to enable and integrate with Google Now cards, you can read the developer docs that has the technical details behind it. Currently only Event Reservation, Flight Reservation, Hotel Reservation and Restaurant Reservation schema is supported.
Google told us they are currently working with select app developers, specifically on the Android platform but the long term goal is to expand this to a wider set of developers and platforms.