Twitter has posted their changes to the upcoming 1.1 version of the API, and it’s a surprisingly minor set (especially minor, given the recent suggestions of hostility towards developers).
Buried right at the bottom, though, under the heading “looking ahead”, is the following:
Since we announced Twitter Cards in June for twitter.com (and in July for Twitter for iPhone and Twitter for Android), we have seen tremendous response; more than 400 developers and publishers are participating in the program, distributing content through expanded Tweets. And over the next several quarters we will introduce new ways for developers to build content experiences and applications into Twitter, through Twitter Cards.
Read: Developers are soon going to be required to implement Twitter Cards in their apps.