There is no official release date for the Bookmark feature as of yet.
Tina Koyama, a staff product designer of Twitter, informed about the testing in a series of tweets. She said the team spent a lot of time figuring out how the feature would work in practice: "We went through all the designed flows and picked the ones that are the easiest to navigate to test out with our community". "In a demo that Twitter demonstrated last month, the user pressed the "." icon and clicked on 'add to bookmarks.' That saved the tweet until the user was ready to read it. We kept this in mind while creating designs for the feature.
The social media platform has not commented about the feature besides tweeting some of the details about it.
Today, you can by now use Twitter's Heart as a method of marking Tweets that you might prefer to come back to read once more later. Keith Coleman, Head of Product, had tweeted that the new feature #SaveForLater was in the works.
It is expected that Bookmarks feature will be available in a menu at the bottom right corner of the tweet in mobile devices and in the v-drop-down menu at the upper right corner of the desktop.
Although its team is busy trying to solve major site-wide problems like the harassment epidemic and verification controversies, Twitter is also listening to users when it comes to seemingly benign UX changes. While new character limit is yet to roll out to all the users, it has been now increased to a total of 50 characters.