I believe there's more behind Tacitus and relating to the moon.
First, when the leaks started happening this one particular picture stood out:
It gained a little ground in making people think the next CoD would be named CoD Eclipse.
MrRoflWaffles found out there is a Total Solar Eclipse happening on the 2nd Tuesday of Nov. (Nov. 13th) which happens to be the projected release date of Black Ops 2.
And now comes Tacitus: http://en.wikipedia.org/wiki/Tacitus_(crater)
Tacitus is a lunar impact crater located to the northwest of the crater Catharina, at the northern extension of the Rupes Altai ridge line. Directly west is the crater Almanon, and to the northeast is Cyrillus. To the southeast of Tacitus is a long chain of craters named the Catena Abulfeda. This chain runs to the northwest from the eastern edge of the Rupes Altai, continuing for over 200 kilometers.
This is where my theory comes into play. On the zombies map Moon we don't know the exact location of Griffin Station. But with all these clues relating to the moon can give us an idea of where Griffin Station is located and how Tacitus plays into the story. So I went on Google Earth and searched for Tacitus and found exactly what the wiki page described. Below in the picture I've boxed both the Tacitus crater and the Rupes Altai ridge line.
The ridge line heads directly into the Tacitus crater, which if you remember from "Moon", The rockets that launched to Earth were located in a ridge line, which matches Rupes Altai's ridge line heading to Tacitus.
Rupes Altai: http://en.wikipedia.org/wiki/Rupes_Altai
Rupes Altai is an escarpment in the lunar surface that is located in the southeastern quadrant of the Moon's near side. It is named for the Altai Mountains in Asia, and is the most prominent lunar escarpment. The selenographic coordinates of this feature are 24.3°S 22.6°E, and it has a length of about 427 km.
The southeastern end of the cliff terminates along the western edge of the crater Piccolomini. It then arcs irregularly towards the north, climbing to heights of nearly a kilometer. The northern end of the arc is an irregular region with no clearly defined terminus, where it brackets the prominent craters Theophilus, Cyrillus, and Catharina. This cliff forms the southwestern rim of the Nectaris impact basin.
From this we can conclude somewhere in the vicinity of Rupes Altai and the Tacitus crater lies Griffin Station. What does this mean now?
We don't know what is going to happen to our crew may it be they stay on the Moon or head back to the Earth. But if we do know the Nazi's experimented over various locations (Der Riese, Kino, Moon, Shangri La, etc.) you can best guess they had to of had multiple stations located on the moon. Tacitus could as well be a hidden base/station inside the Tacitus crater. If my predictions of the location of Griffin Station come to be true, the location of Tacitus Station could be close by but hidden.
Also just found out Tacitus' definition is: Silent
This could mean of 2 things...
1. Providing more evidence towards the moon theory because you really can't hear much in space so it's silent, and that IF there is a Tacitus base it's hidden or silent
2. Or it could be foreshadowing a future towards Takeo, the silent one. Will he stand up, do something we wont expect?
Thanks to Kingsly Zzissou he's pointed out the loading screen for Moon shows out characters walking down a ravine and a crater. And from what we know on the map Moon you don't start off walking down a ravine to the station, or is a crater anywhere near the station. Instead you start off at Area 51 and teleport to Moon, from there you are at Griffin Station. Now this piece from the loading screen further proves the next map will indeed be located inside the Tacitus crater on the moon. What I can guess is the crew heads up the ravine until they reach the crater, specifically the Tacitus one, finding a hidden base inside.