What I'm intrigued by is the fact that the trailer shows the couple coming to really love the commune. What's the conflict here? It's a movie from a major motion picture studio, which means in the end the characters MUST reject the commune lifestyle for something more like a standard consumerist lifestyle, so something bad has to happen on the commune. I imagine it's the bounds of their monogamy being tested.
Anyway, it's a great trailer. I look forward to seeing the whole film - it comes out in February.