Well, the Rickson progeny will make his debut.
Both Kron and his opponent will be making their MMA debuts.
"Kron Gracie, Son of MMA and jiu-jitsu legend Rickson Gracie, will meet Hyung Soo Kim in a lightweight bout at Real Fight Championship 1 on Dec. 23 in Japan, the promotion announced."
It looks like they're adopting the Royce Gracie attitude toward MMA - which is to eschew crosstraining.
"'He’s focused, he wants to bring jiu-jitsu back to MMA," Gracie said. "He’s not doing crosstraining to work on his weaknesses. He won’t start boxing, kickboxing, wrestling. He will use his jiu-jitsu to neutralize the wrestler, the striker, and work on his expertise.'"
"Roberto Satoshi, who competed against Jake Shields at Metamoris 5’s secret match, will also compete at the event, facing Jeong Doo-Jae in a lightweight contest. BJJ champion Gabi Garcia is also expected to make her MMA debut at the event, but her opponent is still yet to be announced."