When Cards was first introduced, Twitter had given the developers three types of card to play around with— summary, photo, and player/video. Now it has introduced three more types of cards to the list, called App, Product and Gallery.
App Cards will display specific information like name, icon, price and rating of the app directly from the App Store or Google Play. The Product Cards will display an image and description of a particular app, which can be combined with the App Card to show most of the information about the app that you normally see on the Stores. Finally, the Gallery Cards will show an album or collection of photographs through a preview of the photo gallery.
These new features are already available for developers and some big name developers such as Foursquare, Path, Angry Birds, Etsy, Flickr and SoundCloud have already signed up.