Capping-off Deadline’s debunking last week of the fan rumor that Katee Sackhoff and Gina Carano would be co-starring in a spinoff series from The Mandalorian with the pair reprising their roles of Bo-Katan and Cara Dune.
Katee is now flat-out denying it’s existence as well during an interview with the outlet stating the following.

SACKHOFF: “I have absolutely no idea what you’re talking about, that’s legitimately the truth.”
She added what makes the character interesting to her.
SACKHOFF: “She’s a warrior and she has struggled tremendously with being a leader. For her, I think there is a struggle and a story about who she becomes in peace, if that were to ever be accomplished and what kind of ruler she would be. She’s never really, that we’ve seen, gotten that opportunity, and whether or not she’s ready for that. Just because she thinks it’s her rightful place, doesn’t mean she’s ready or equipped to rule Mandalore.
While speaking with Entertainment Tonight she hinted Bo-Katan important part of The Mandalorian.
SACKOFF: “She’s been such a pivotal character in this world and she’s so important to this story in The Mandalorian and where it’s going.”
SOURCE: DEADLINE