Wargamer.pl has put a whole bunch of add-ons up on their The Deluge: Northern War 1655-1660 Kickstarter campaign. There’s plenty of terrain options and units you can add to your pledge.
From the campaign:
Taaadaaa!!! 22500£ reached! So we have Brandenburgian Dragoons unlocked! New Old Type Infantry miniatures are on horiozn as well! So now you can plan your pledge ahead and reach those new exciting goals. Go and check this newest update.