Is that a "I know there will be another one because logic," or a "I know there's another one because I'm working on it,"? I won't bother asking any more questions because I know all staff will be under NDA about thing such as this.
I'm gonna do a pro move and quote from our blog from December 2022:
"While we do not have anything concrete to announce at this point, given the popularity of Anno 1800 it should not be a surprise that we are working on the future of Anno."
This statement is still true.