Time Out says
There's really no focking place for the franchise to go anymore, having exhausted its original scary-dad anxieties (Meet the Parents) and subsequent rude-baby mania (Meet the Fockers). Still, it multiplies, this time having its way with the stars' cinema pasts---De Niro gets especially shameless with the "Godfocker" stuff---and a nonaffair between Ben Stiller's meek Gaylord and a home-wrecking pharmaceutical rep played by Jessica Alba. She pushes him into a freshly dug backyard pool and leaps in herself. At least they're being honest about rolling in the muck.
Watch the trailer