You should try contacting Eric from Bumper Plugs. He is a member on this board but I don't remember his exact handle. If you search around you will find him. Or go to his website:
www.BumperPlugs.com. I got the ingredients from him (or at least his post on 6Speed earlier this summer).
If you get any more info (or samples) please do share with me. I am also waiting for the MkII.
I think the reason you can get Horizon but not Fountain from PPG is because Horizon has been around a while and at one time was a standard color, whereas Fountain is a new paint-to-sample color.