I had been searching for that song also. As soon as I saw that trailer on G4, I went looking. No luck though. Hopefully someone else has gotten close to finding something about it.
*Edit*
It'll be nearly impossible to find information about this song. So far, I've found people suggesting it may be a Jpop artist who goes by Zoey, or someone by the name of Leigh Nash; though I can't tell for myself. Someone put some of the lyrics up here also,
http://www.gamespot.com/ps3/adventure/codedarmsassault/show_msgs.php?topic_id=m-1-37651673&pid=932988 . They are not 100% accurate, nor are they the entire thing.