So tomorrow he's playing his most important game ever, with white against joint leader Aronian in round 8 of 14 of the Candidates Tournament. A win for either would be a huge step towards winning the tournament since the first tiebreaker is the results between the players in question (their first game was a draw). This means the loser would need to better the winner's score from the final six rounds by 1,5 points, and even a mightily impressive +4 =2 finish could very well be too little.
But anyway, Carlsen is in ridiculous form (one loss in his last 60 games or something, +18 =15 since October), so I think he's the favourite after tomorrow's inevitable draw. He was lucky not to lose today, though, but that'll probably just make him sharper.
(The winner of the tournament will play Anand for the World Championship.)
Tournament site
Watch the games live