Fifth-year Cedric Diggory is the new Seeker and Captain. For some reason (I blame the GoF movie), I was under the impression that Cedric was three years ahead of Harry, not two. But this! This puts him in the same year as Fred and George, which suggests all sorts of fun pranks in Herbology over the years.
(Also, I wonder about the dynamic on the Hufflepuff Quidditch team before Cedric's "arrival.")