After Hu Tao co op prank in v1.10, there will be Katherine co op prank and Amber co op prank, and then a finale, with loads more content in between, with at least a small scene and a hot springs scene with every girl up to sumeru.
After the game is complete I'll add 'DLC' with girls from each new region, and maybe start a new game in the meantime :)
Thanks for playing!