What is the meaning of the Black Ops "Ascension" numbers

During the intro of Call of Duty Black Ops one of the cut scenes has a lady read "Ascension 7-15-1-2-19-7-25-6-13-6-7-15-14-0" into a microphone.

Is this relevant to anything other than the single player campaign? (Which I haven't played through yet)

No, there is no known relevance to anything other than the single player campaign.

Since you haven't played through the single player campaign, I won't give it away, but you can look up the meaning of the numbers here on the Call of Duty Wikia. Also, you can use the terminal in the menu (Accessed by tips in this question: How do I access the hidden mini game in Call of Duty: Black Ops?) to DECODE the numeric messages if you'd like to do it alone.

Ascension is the name of the first zombie map from the new map pack :D

http://www.callofduty.com/BLACKOPS/DLC

http://en.wikipedia.org/wiki/Numbers_station

The newest zombie map in DLC is called Ascension.

Ascension is the new Nazi zombie map on the new map-pack which will be released on the 2nd of February for Xbox. There hasn't been an announced release date yet for PS3 or PC.