A few people (see lots of people) have asked, so here’s some deets on the Skullcandy Headset for AC4, as posted here.
Model: SMSLFY421 SLYR
Scheduled Release Date: 29th October 2013
Normal SLYR headsets (non game branded) are available to purchase now at places like Best Buy.
The AC4 specific headset can be preordered from Newegg.