Re: Your expectations for Djokovic in 2013
He'll remain the best tennis player in the world by a distance and win one or two Slams. He will systematically make semis and finals of big events (Slams, Masters, WTF). Pretty much the same as in 2012, really, a clear #1 although not as overwhelmingly dominant as in 2011. Also it'd be cool if he completed his career Slam at RG, which is definitely a possibility, especially with Nadal out for so long.
I think his Slam SF streak might be snapped as he might lose a QF, most likely venue for that being Wimbledon of course, but wouldn't be surprised if he kept it going either.