Releases in Japanese theatres January 12, 2024. There is also a PV you can check out here.
I am not well versed in my monogatari, but as far as I can tell, this is a compilation movie summarizing three other movies that comprise the Koyomi Vamp arc.
I wonder if it’s to get a bit of extra cashflow for sequels, without needing to invest much time into it. Often, I feel like a summary does tend to mean something new is coming.