We heard back in September of last year that Seth Rogen and Evan Goldberg (directors of This Is The End, writers of Superbad and The Pineapple Express) were moving over to animation, with the raunchy R-rated animated comedy called Sausage Party. Now we know some of the actors who are going to lend their voices to it. And, yes, it is those actors you're thinking of.
On the cast of Sausage Party is a lot of the usual crew of a Rogen/Goldberg film: Seth Rogen himself, James Franco, Jonah Hill, Michael Cera and David Krumholtz; also on the cast are Nick Kroll, Kristen Wiig and Edward Norton. All are very funny guys and/or talented actors or talented Kristen Wiig.
Rogen and Goldberg are writing the film, alongside Kyle Hunter and Ariel Shaffir; it's being directed by Conran Vernon (Shrek 2, Monsters vs. Aliens) and Greg Tiernan (Thomas the Tank Engine & Friends). Per the logline we got back in September, Sausage Party is about "one sausage’s quest to discover the truth about his existence. After falling out of a shopping cart, our hero sausage and his new friends embark on a perilous journey through the supermarket to get back to their aisles before the 4th of July sale."
No concrete release date yet, but 2015 is still being aimed for.