2nd DLC is 15th October, so they are well behind the original in terms of launch cadence. Assuming the pattern applies, I'd say DLC 3, will be Feb or March 2021, with the PC version launching very soon after or concurrent with that.
Thank you!!! Great news, now I know which character I want to play through with first if that's possible. Hype just went up big-time. Crazy how good their characters look and the color scheme is really nice.