Premieres sometime in 2025. The new PV is here. Check out the ANN article for additional information. Synopsis from AniList:
All alone after the end of days, two girls bike through the empty ruins of Japan—and they’re not about to let the collapse of civilization get in the way of sightseeing! Even when the world ends, their journey goes on.
The title is a clever pun on 週末 (weekend) both pronunced shuumatsu