When Bat/Cat was first announced, they mentioned that the Catwoman book was still continuing. I would imagine while the issue is wrapping up that story, the book will keep going catching up to the present timeline with Selina doing her own stuff in Gotham alongside whatever else she's doing in Tynion's Batman and then eventually in Bat/Cat. I feel like they'll only end up getting rid of the book is Joelle Jones gets a new project instead.