Are you playing on PC? I'm playing it on Xbox. Some serious issues with the Xbox version of this dlc.
Yeah, he either somehow scored a copy of the PC version early (which is impossible since the port doesn't exist yet and early acquisition is not advisable), or he's a time traveler.
No, seriously, he is a 360 player, since PC won't get Dragonborn for another month or two. I wouldn't want anyone to think he is up to no good and get in trouble for something he likely didn't do.