Figured I'd start this now, as Modern Warfare 2 is out and I'm noticing more threads about it popping up.
This may be a little early, but, then again, so am I, most of the time. ;3
Here's the hizzy:
If inductive reasoning is worth anything, we can expect it out for the Fall / Winter season of 2010. Also, by this logic, it is approximately half way through development.
As far as we know, there are no concrete plot details, trailers, or ingame videos floating around at this point. What we DO know is that it is definitely in development, is being made by Treyarch, and is set primarily in South East Asia or the Koreas. However, it will also probably feature campaigns relating to the Cold War and The Cuban Missile Crisis.
It will most likely have a Korean War, Cold War (that means the Russian / Afghanistan War, too) and / or Vietman War setting.
Call of Duty 7 is the working title, but it will most likely change at a later date.
Considering Treyarch's past actions, there will likely not be a Mac version.
Here's my two cents:
Judging by Treyarch's Call of Duty Philosophy, which seems to be "make whatever Infinity Ward did before you, but amp up the intensity by whatever means necessary".
After Call of Duty 2, 3 came around, and basically offered the same thing but longer, with better graphics, and with more developed relationships with your squadmates.
After Call of Duty 4 came out, World at War offered slightly bumped up graphics, a longer storyline, Nazi Zombies, and a darker, less jokey atmosphere to try to stand up to Modern Warfare's cinematic presentation.
Now, with Modern Warfare 2 giving us a high octane plot filed with more diabolical characters and plot twists then there are curves in a can of silly string, and enough wild explosions and fight sequences to make Duke Nukem blush, I expect Call of Duty 6 to try and be even MORE extreme, but still feel very samey to World at War and the Russian segments of Modern Warfare, just with slightly different colored Asians.
Home Reference:
http://www.gamespot.com/pc/action/callof duty7workingtitle/news.html?sid=6239258&
om_act=convert&om_clk=newsfeatures&tag=n ewsfeatures;title;1
http://www.gamespot.com/news/6209640.htm l
http://www.gamespot.com/news/6209135.htm l