I've been having all sorts of problems with getting DLC to work. Here's what I finally did:
Go to WWE Shop. You must download every single wrestler and bit of DLC individually. You can get the pack, but you still have to go and download every single wrestler and attire.
Once you do that, you MUST exit your game to the Dashboard. Restart.
Now, for some reason, this didn't work the first time. It might for you.
But when I exited to the dashboard the second time and was about ready to give up, the next time I started the game, they did in fact appear in the "Downloaded Superstars" section.
So you get..
Shad Alt Attire
Shawn Micheals Classic Heart pants, Face and Hair Attire. (Like you went back in time)
David Otunga
Justin Gabriel
Wade Barret
NXT Arena
NXT 3-Man Entrance (I was wrong, this doesn't exist.)
NXT "Wild And Young" song
NXT "If I Can Get Through This" song
NXT "We Are One" song
British Bulldog
Lex Luger
Layla
Moves for each, and i'm pretty sure Luger's Torture Rack is a struggle submission, which sounds like a lot of fun.
I admit I was never a Luger fan, but in a video game, having that SS Torture Rack is worth downloading him alone.