Jason Alexander was on Oprah and he said this might be it for Seinfeld. If he, Julia and Michael can't reach an agreement with NBC? on a new contract, they will end Seinfeld.
They also showed outtakes during the show. One was with Jerry in a confessional telling a joke to a priest. George then interrupts them. It was funny because Jerry just started laughing. I would have to guess it is an upcoming episode.