It kind of funny to me that becoming Baba Yaga's Riders could be a boon to the PCs.
For one of my characters, I had added an event in his backstory where an "agent" of Baba Yaga encountered him and saw (well, tasted really) rider potential. He'll be getting subtly recruited over the course of the AP; it's hard to say how the character will actually respond to the offer...time will tell.
Can't wait to get a hold of this book...I also have a Jadwiga character in the party and I'd really like to provide an opportunity for him to encounter the daughter who is his great-something-grandmother.