Ranked finishes 30.10. for sure, it has been confirmed. Patch coming out with new season of Ranked would be the only rational thing to expect, but unexpected delays could have happened during development and implementation so it could be different, but probably won't happen.
But if you expect the unexpected then the unexpected is no longer unexpected, meaning you expect the expected, which you already should. The real question is: Did you expect that?
That's why my motto is: Don't expect anything, instead prepare for everything.
Safe to assume .... The game stays in open beta til end of December ?
Will ThroneBreaker come out mid season ..like first of December ?
or End of December and season ?
Will we get Thronebreaker first of Nov...starting with the new season ?
What are these REDs up to!?! That's the real question
Yes, I presume it will be staying in Open beta, as everything is not yet tested out fully from mechanics to bugs etc..., and by calculating on the months we had patches heading into season after season, this new season will most likely begin early on 1st November 2017, leading on until another 3 months for next season, most probably we will be seeing Thronebreaker come out around Mid January or End of January. Hope this helps!