While I am sad that Taleworlds is leaving, I find it wonderful that Paradox is letting them leave and wishing them luck. Most publishers would force devs to stay and keep hold of their IP's. This shows you that Paradox is a great company.
That's because Paradox never owned the IP, they just provided marketing and distribution. I'm guessing Taleworlds made more than enough from the great success of Warband to fund this themselves for Bannerlord, whenever it comes out.