Tweets are holding steady at 140 characters, but a variety of additions to your tweets will no longer count against that limit.
Twitter said today it was rolling out expanded tweets around the world. Media attachments including images, GIFs, videos, and polls will no longer count against the 140-character limit. Neither will quote tweets, though if include a link to another tweet in your own that will count as normal.
Much ado over not much. I hate Twitter.