Ever since I heard about this movie, I thought it was bizarre that David Gorden Green was directing it. When I met him at a screening and Q&A for Undertow, though, he kept talking about how much he loved silly low budget 70s movies, so I guess it makes sense.
I thought it was weird too and I thought that either Green would have to stifle his style, which is what makes his movies so great, to accomodate the improvisational manner in which Rogen, etc. works, but based on the trailer it looks like a David Gordon Green Movie, and sounds like a hybrid between Rogen and Green's style. Also if you go back and look at Green's movies, theres a lot of humor in them, and I know he has actors improvise a lot, so the fit might not be too crazy between the two.
Also if you don't like this, Snow Angels is coming out next month, so there's that.