It turns out that diner meeting between Jerry Seinfeld and Jason Alexander this month wasn't for a Super Bowl ad after all.

Alexander told New York radio station today that his former "Seinfeld" co-star is working on a secret project he would only describe as a "short-ish form" project.

He did say it would involve his George Costanza character from "Seinfeld" as well as the show's co-creator Larry David.

Speculation began to mount after Seinfeld, Alexander and David were spotted at New York's famed Tom's Restaurant on Jan 13.

The real-life eatery doubled as the cafe the "Seinfeld" characters often patronized on the 1990s sitcom.