At this point, I am unaware of any plans to include any music from new age bands IN the game. (Unless Cesar forgot to tell me something. Which is always a possibilty.) Simply because the mood and setting don't really call for it.
There WILL however be a seperate soundtrack, most likely for download, which will include music from the game and possibly some bonus stuff. Maybe we'll do some different versions of the in-game music in various styles... Suggestions are ALWAYS welcome.