Sounds great, especially the early to mid 17th century book set in Eastern Europe appeals to me of course.
I assume there'll be Gabor Bethlen's campaign(s) in there, some Ottoman stuff and so on. And I've had a really hard time finding anything on Bethlen's exploits so far (at least things I could turn into a wargames scenario).
Some of the guys 'round here are discussing doing small-scale SYW once the whole pandemic thing is over, so maybe that's an excuse to get Twilight of the Soldier Kings!