So after all the "he-will-guest-star" versus "he-won't-guest-star", it seems Javier Bardem will in fact be making an appearance in season 2, as confirmed by Ryan Murphy:
Javier Bardem basically talked his way on to the show. When the Spanish actor, who will next be seen in Murphy's Eat, Pray, Love, told Entertainment Weekly that he would be hamming it up as a rock star next season, word spread quickly. But both 20th Century Fox TV, the studio that produces Glee, and executive producer Dante Di Loreto claimed the report wasn't true almost as quickly. Murphy set the record straight: "Javier had downloaded every episode and told me he watched them in a crack binge," Murphy said. "He said, 'I want to come on the show. How about you write me something?' And how do you say no to Javier Bardem? You kind of don't."
Not to mention all the other season 2 snippets Ryan has for us, over at TV Guide. Check out the full article here for more spoilers.