Additional API blackout tests to continue up to final shutdown
Version 1 of Twitter's API, which many legacy clients use to pull and display information from Twitter, will have its retirement extended by over a month due to additional testing. Twitter had originally laid out a date of May 7th in conjunction with the shutting down of TweetDeck apps for Android and the desktop, which put the API discussion at the top of many user's minds. When the v1 API is finally retired, older clients that have stuck with it will cease to work and need to either move to v1.1 or shut down. Luckily, most of your popular clients in the Play Store have made the move to be compliant.
The waters will be rough over the next month still, however, as Twitter will be conducting additional "blackout" tests on the v1 API to make sure everything is ready to go with v1.1. Additionally, developers and users alike with clients using v1 may experience additional problems such as errors loading or searching Tweets in the client.