A video that aired during UFC 199 featued Brock Lesnar punching a camera as he smiled before unveiling the official news that Lesnar will be fighting at UFC 200 on July 9:

WWE issued the following:

Brock Lesnar remains under contract to WWE, however, he has been granted a one-off opportunity to compete at UFC 200. Following this milestone event on July 9, Brock will return to WWE for Summerslam on Sunday, August 21, live on WWE Network.