I just saw
this video on
PS3Blog.net which apparently shows a bridge heading to a new area.
I have to say that, if this is the airport, I'll be more than a little hacked off, since the airport was shown in the original map and should have been in the final game.
I'm not a skinflint - I'm happy to pay for DLC which is developed post-launch and adds to the game. However, if EA/Criterion had the airport in from the beginning, that means that they removed it from the game for the sole purpose of charging for it as an add-on later.
If this does turn out to be the case, I'll certainly have to think twice about purchasing it.