Well, that was quick. From World of Reel, the site that first brought us news of an upcoming CK feature called Later the Water (reports later confirmed by Deadline) comes this disheartening update:

Production has shut down on Charlie Kaufman’s ”Later the War,” no clear reasons were given to me, but cast and crew have left, and one of the Polish producers bailed.

Actors Eddie Redmayne, Tessa Thompson and Patsy Ferran were in Poland for this one, but have now left, which means we’re probably never going to see this film get made, unless the entire thing gets recast.

“Later the War” was supposed to be an adaptation of Iddo Geffen’s short story “Debby’s Dream House,” and would have continued Kaufman’s fascination, and blurring, of dreams with reality in cinema. The story follows a man who manufactures dreams for people but ultimately begins creating nightmares for them.

The project had gotten a grant from the Polish Institute of Film, and comes more than five years after the release of Kaufman’s last film “im thinking if ending things.” (Source)

Given the filming location, the shutdown could be related to Trump's tariff on American films being made overseas.

The first news about this film came less than 3 months ago. Take today's news with a pinch of salt until we hear anything else, but World of Reel are the ones who broke news of the film in the first place.