Some leaks suggested X670 at the end of the year but I'm 90% sure it's fake news.
B550 and X570 will be the prefered platform for the new processors. Personally I'd go for B550 because they have excellent VRM's and no fan (unless you specifically need the extra PCIe lanes.)
That wouldn't make any sense, there's nothing they could add to warrant a new chipset. My guess is X670 will be AM5 and support DDR5 and so on.
