Dragon Ball Super is set to debut in Japan this summer. And according to a producer for Fuji TV (where the show will arrive), it takes place after Goku kills Majin Buu in Z. But this time, "An enemy even stronger than Buu or Freeza may appear."
And of course Akira Toriyama will be writing the scripts-as he should. Can't wait for dat' Funimation dub to drop.
Credit for picture goes to http://www.meristation.com/playstation-4/noticias/dragon-ball-super-akira-toriyama-escribe-la-secuela-de-dragon-ball-z/1985542/2058167