Also starring in the film are Emma Thompson, Dustin Hoffman, Adam Sandler, and possibly Grace Van Patten, an interesting mix to say the least. The story apparently centers on an estranged New York family coming together in preparation of artist & patriarch Harold’s career retrospective.” Thompson opened up a little about it in USA Today, saying her character is a "dreadful, passive-aggressive alcoholic". They also refer to the title as The Meyerowitz Stories, which sounds like a much easier sell.
This one seems pretty fresh, so expect more details to arrive at some point; probably not from Baumbach, though! It's clear he wants to keep this one firmly under wraps until closer to release.