Twitter's premium service will be called Twitter Blue.
The subscription service will cost $2.99 per month. Its features reportedly will include the ability to unsend tweets and to create collections of tweets. It also appears that Twitter is working on a tiered subscription model, which could mean a less-cluttered, premium experience for the highest-paying subscribers. Link
Update: Twitter has updated their Apple App Store listing and it now has an in-app purchase of "Twitter Blue" for $2.99, which pretty much confirms the Twitter Blue rumor
