Currently almost everybody is saying that Ascension happens after Kino and before Cotd. Now i don't understand this. Here is my reasons.
The most logical way out of Kino is teleporting. You don't start Ascension being teleported, you start on a lander.
All of the characters look diffrent. However they look the same way in Kino and Cotd.
Red eyes before they removed the moon on Ascension and changed the menu screen the characters had red zombie eyes.
In the radios Yuri says he see Sam, If she was in the pyramid how could he have seen here?
Last and this is the biggest one. Takeo says he wants to kill Richtofen for what he has done. He says something similar at the end of the Moon easter egg. In Ascension he didn't have a big reason to kill him. He never talks about it at all in Shangri La.
So i think in the Blops II zombie maps will get Sam her body back, Undue the effects of the rockets from Moon easter egg, and Sam will be able to freely travel between the Aether and Earth/Moon.