As part of today's rollout of Facebook's AI-powered personal assistant to all users in the United States, the social networking company mentioned that you should now start seeing a redesigned message compose interface within the mobile Messenger app. We first caught wind of this new iOS 10 Messages-style chat experience two months ago.
At the time, Facebook was still testing the redesign with a small percentage of users. The new way to compose messages is currently rolling out to Messenger users across the globe so check back in a few days if it's currently unavailable to you.