Seth Rogen as The Green Hornet? There have been myriad tries at making a Green Hornet movie over the last 30+ years; but this project has both a release date and a teaser site up. Supposedly, Rogen is going to write the movie; and play it straight.
There is potentially a great popcorn movie to be made about a rich guy who infiltrates the underworld by posing as a master gangster, and who tears around the midnight streets in a souped-up gas guzzler with a martial-arts master by his side. Whether this is going to be that movie remains to be seen.