He actually commented on a question in an interview last Wednesday about his contract, saying something to the effect of "I'm good, everything's good with me"! It would be a good assumption that with Paul Allen's resources that Carroll is here until he retires. His original deal was 5 years / 35 million, it finishes after the 2014 season (or technically after we win the SuperBowl on February 1 2015 in the University of Phoenix Stadium)
About Schneider - Per ESPN - GM John Schneider initially signed a three-year deal through 2012. Schneider and the Seahawks quietly extended his contract through 2016.