No updates yet about this one. I'm also pretty excited as well. I would suggest you check on the official link from time to time. I'm sure that as soon as one is available they would be posted immediately to the news feed: Call of Duty®: Ghosts
Think the YTs like Tmartn and Ali A are headed to LA next week (at least I know Tmartn is) normally when that happens it's because they are going there to record early gameplays of the new maps. I think we will have a trailer no later them a week from this Tues...with the map pack released Aug 5th.
I'm also looking forward to the release of the 4th Map Pack. I bet it'll be awesome like the first three.