At first I would like to mention this article is purely speculative, but still I think it's a very interesting theory and you probably would like to read it.
After some searching and decyphering on the mystery boxes on callofduty.com I have come up with the following theory:
Tacitus is a name commonly mentioned and referred to on the new callofduty site, while I was watching a movie on YouTube where someone somehow manages to translate the coordinates from the latest image into a location called Tacitus I saw a website coming by -> www.tacitus.com
It's a pretty vague website at first and there is barely a description on it of what it should be or what Tacitus is, but just to be sure I tracked down the website through my command prompt and whois. I found out that the website was originally registered by a guy named Howard Coale from NY, who worked at Tacitus as President & Chief Interaction Designer, a company that probably went down in 2009, but is supposed to be rising in 2012, as quoted from their website.
Up to this point, nothing interesting you think, however until I found Howard Coale's profile on LinkedIn where a description of the company was mentioned telling me they were specialised in 3D Design, modelling etc with video games. What if after the 'death' of the former Tacitus Project in 2009, they got in a coorporation with Activision and Treyarch and they have started a new Tacitus Project 2012, rising as quoted from the website. What if it all points out the name of the greatly improved or, perhaps, totally new engine developed for the new Call of Duty title -> Tacitus 2012?
Of course it's all pure speculation, but Treyarch has told us last year that big changes will impact their new Call of Duty title, what if they are about to announce the biggest change in history of the Call of Duty saga, a new engine. What if everything on the site is pointing out this new engine, without anyone thinking about it, because they never did something big like this before? If they would build a new engine, the game will probably attract a lot more gamers, who are now primarily not buying the game, because it looks so old and doesn't have new graphics and always is the same like the title before. It would break all their sales records and give the game probably all awards possible to win in video game world.
Once again, it pure speculation, but a truly interesting possibily and I wonder what you guys have to say about my theory!