Kang the Conqueror is currently the main antagonist in the Marvel Cinematic Universe (MCU). However, there is no official announcement or confirmation about a villain replacing Kang in the MCU.
While the future of the MCU is constantly evolving, it's important to note that Kang is a complex character with a vast history and numerous potential storylines. It's possible that Kang's role will continue to expand within the MCU, rather than being replaced entirely.
It is also important to remember that the MCU is full of surprises, and new villains could emerge at any time.