They should be out tommorow. The 16th May although I don't know what time they are going to be released.
chances are the server will fall over with so many people downloading them....will give it a few days before I do so....Also, its Double XP points on weapons this weekend too.
Probably about 6PM tomorrow (I think that's 10AM for the Treyarch team?) when they start double XP and stuff is this time so its just a guess the DLC will be out then, too.
Tomorrow morning in europe, could be anytime between 9-11am.
in the u.s, its out the 15th at 10.30pm (pacific)
They have always released 12am PST and 3am EST but I'm not stayin up this time for it because I'm on the east coast and need sleep!