They sure are nickel and diming the shit out of this motherfucker. These are Facebook-Links. So I am not sure if they work.
No word on when they are available.
From the 2kK Forums: Both of these packs will release Thursday, August 11. Each of the add-ons will cost $4.99, or you can buy them both together for $7.49.
PS: Will buy all of that. Like the old one. I love this game to hell and back. I know it is a bit retarded, I just hate the CivIV "stack of doom" so much.