UPDATE 31/8/22: Despite earlier word to the contrary and a listing on the Windows Store, Paradox has clarified Victoria 3 will be exclusive to Steam when it comes to PC on 25th October - meaning it won't be on Game Pass for the foreseeable future, at launch or otherwise.
Announcing the news on the Paradox forum, a community ambassador for the company explained, "After discussion with our partners it was decided that Victoria 3 won't be a part of Game Pass or Microsoft Store." Paradox offered no further explanation, only saying it "[looks] forward to sharing more details on our next partnership with Xbox in the future."
ORIGINAL STORY 30/8/22: Victoria 3, the latest entry in Paradox Interactive's long-dormant society builder series, has been given a release date and is coming to PC and Xbox Game Pass for PC on 25th October.