It's in theatres now -- I know there was an old thread about it and some folks seemed quite excited. I finally got to go last night, and enjoyed it pretty thoroughly.
Critics have complained that it is a re-tread of Woody Allen movies, and it pretty much is. The screenplay was actually written in 1977, and not really updated beyond a few cultural references and such. I've only seen a few of Allen's big films (Manhattan, Annie Hall, etc) and even to me it is a little same-y. There's the fourth-wall breaking, the older man in a completely implausible relationship with a woman 1/3 his age, the cool old jazz music, etc. It's all pretty familiar, but I don't think that makes it any less fun. Plus it's nice to see Larry David give his own take on Allen's usual persona.....much more bold and abrasive. My major complaint is that the story wraps up very quickly and very neatly, almost out of nowhere. Still very funny, though it feels a bit less realistic since so many of the characters are sitcom-ish stereotypes.
Go ahead and see it if you are interested. Don't watch the trailer, as it essentially gives away 2/3rds of the plot. It's about an old New York curmudgeon who lets a Southern belle teenage runaway live with him. Hijinks ensue, etc. That's all you need to know.