Most of the tunes for the '12's didn't come out until the end of 2012. I've heard it shouldn't be as long for the '13's though. They're hoping for mid April I think.
The 11 and 12 tunes took a while because of the ECU encryption, but what I am hearing is that for the 2013, they have the encryption, but they still need to setup the tunes for the new 2013 ECU's and the 8 speed transmission. As others have indicated, they originally said end of March or beginning of April, hopefully they will be out shortly.