I read that people that pre-order the game can already play Angel City. People that didn't need to wait till dec 3.
It would only be there if you pre-ordered the game then it is there today, otherwise yes you are correct not til Dec 3.
Just out of curiosity, did anyone else notice that the image for this thread is of the "Relic" or "Odyssey" map when the DLC includes the "Angel City" map? I saw the image and got excited and thought, "Wait! Are they putting out another DLC right away with the 'Relic' map? That would be awesome!" Then I realized the thread was about the 'Angel City' DLC.