Free League announced the first expansion for 4e,
Urban Operations. Pre-order starts Q1, 2022 and the physical copy is scheduled for release in Q3. It sounds like the PDF version will be available with the pre-order.
https://www.seenit.co.uk/free-league...xpansion-pack/
The product includes Free League's iteration of
Free City of Krakow and a Swedish surrogate (Karlsborg), along with general mechanics for urban warfare.
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