That's it Twitter trying a new one feature with a small group of people. This time, it is not an updated version of the profile but a new way to do retweet the messages of the people you follow.
“Retweet with Comment” will allow the users of platformto get more space to comment on a message. In fact, it will display the original message as an attached message. This means you can have the 140 characters to comment whatever you want.
The new feature will be especially useful if you want to add your point of view, but the original publication has already used all the allowed characters.