Focus Features has just debuted the official trailer for Noah Baumbach's newest film Greenberg starring Ben Stiller, Rhys Ifans, Jennifer Jason Leigh, Chris Messina, and Greta Gerwig. Word is: "A New Yorker named Roger Greenberg (Ben Stiller) moves to Los Angeles in order to figure out his life while he housesits for his brother and sparks with his brother's assistant named Florence (Greta Gerwig)." ocus Features is bringing Greenberg to theaters starting on March 12th, 2010 next year.