In their patch notes they just mention that they'll be pushing 1.5.10 to main branch once they've ironed out all the "outstanding issues."
They never mentioned anything about straight up removing it as an option though. If I didn't just spend like 2hrs yesterday searching for/tweaking individual mods to my preference I'd hop on 1.6, but I was happy enough with 1.5.10 to call it the branch I was going to sit on/continue to mod until more content is added. (never really modded bannerlords up till this point because there were still some key features I felt were missing that mods didn't add yet. 1.5.10 can give me basically everything I want for the time being with mods that quite literally less than a week ago were updated to 1.5.10.)