The Switch is an upcoming comedy movie directed by Will Speck and Josh Gordon and starring Jennifer Aniston and Jason Bateman. The film will be released on August 20, 2010.
Here’s the first official movie trailer of the Switch:

THE SWITCH
Plot:
“Kassie, a smart, fun-loving single woman, decides it’s time to have a baby despite her neurotic best friend Wally’s (Bateman) objections. Even if it means doing it by herself… with a little help from a charming sperm donor (Patrick Wilson). But, unbeknownst to her, Kassie’s plans go awry because of a last-minute switch that isn’t discovered until seven years later when Wally finally gets acquainted with Kassie’s cute–though slightly neurotic–son.”

There is something of the Hangover in this film. Jason Bateman is awesome. Definitely want to watch the Switch, looks like a damn great comedy movie!
:)