Brave New World only has one post-credits scene, but it’s a big tease for the future of the Marvel Cinematic Universe.

Kang the Conqueror is a villain from Marvel's Avengers comics. He has fought the Avengers, as a team and individually, many times. In the MCU, he's a villain, but he will likely not appear in Avengers ...

and Thanos), put together and hidden by Fury. G'iah uses the Harvest to power up (making her seemingly the strongest character in the MCU) before taking it to Gravik, disguised as Fury.