Gee, I can't find a decent description of the well being either. I checked my 03 Passporter, and the guide on allearsnet.com. The only thing I found was that they use aromatherapy oils.
Whats funny is that I'm having the couples massage/well being next Monday at 2PM on the Wonder. My wife picked it out. Personally I would have gone with the Spa Taster. Look for a trip report when I get back.