If you're still following ER, here's all of the latest news regarding the series:
-Back for next season (the 15th and final): John Stamos, Parminder Nagra and Linda Cardellini. Mekhi Phifer has not yet signed on.
-Back for some of next season: Maura Tierney and Goran Visnjic (both will leave after a few episodes). Noah Wyle is also contracted to return for at least 4 episodes.
-Not back ever: George Clooney and Julianna Margulies (though maybe we should give her a little bit more time...perhaps ask once more after Canterbury's Law is officially canceled?).
-Though rumored, Shane West will not be returning to the program (as doctor Ray Barnett) this season, though the producers are open to having him appear for the 15th and final season.
-John Stamos will not be starring in - nor was he ever asked to be - in an ER spinoff.
Sources: TVGuide, E!Online, USAToday