Seriously though, I'm sure the issue is something on Steams side of things. All we can do is wait it out. I mean, waiting a few hours isn't so bad. They could have, you know, just decided not to release DLCs period.
Yeah, seriously, give Gabe a break. He got his head stuck in the KFC bucket again. The Valve team also misplaced the jaws of life to cut said bucket off Gabe's head. Gabe keeps the launch codes for all new releases in a key box behind his ear. So, until they get the bucket off his head we'll just have to wait.
Need I remind everyone again that we live in a world with computers? Why hasn't it been programmed into the system to automatically release? I'm sure my answer will come "Soon".