According to the announcement by the NSAC, Lesnar is, "suspended until June 28 due to an abdominal injury, though he can be cleared early by a physician." This is nothing out of the ordinary as numerous UFC fighters are suspended after their fights. It's done as a way to protect them.
Lesnar as previously reported retired from MMA after the bout.
Reporter's Link:
Brock Lesnar Already In Talks w/ WWE [>>]