The film focuses on a couple who decide to travel across the US, trying to find a perfect place to hunker down and raise their family. Collette was set to play their friend, a university professor who thinks their child will be dysfunctional no matter where they live. Variety ups the description by saying that she's a bohemian prof who is an old friend of John Krasinski's character. (Maya Rudolph is playing his wife.)
In its vagueness, it doesn't sound like the best plot I've ever heard, but I imagine that it could make for some entertaining cinema between the eye of Sam Mendes and the words of Vendela Vida and Dave Eggers. As for Gyllenhaal, I like seeing her continue to expand her diverse portfolio of roles. Production is currently under way in Connecticut.
*"Relationship comedy" keeps getting used to describe this film. Are the powers that be trying their darnedest to keep people from calling it a romcom?