I think the dlc we see this Autumn will be mission packs.
But i doubt we will see a new city, i think that's something R* would like to do eventually but R* and Microsoft have said the content will offer 10 hours of additional content, which just doesn't add up to it being a new city.
Perhaps at a later date but not the DLC the 360 will see this Autumn.
So I'm predicting a fairly beefed up mission pack.








