There's no new information there.
Chad mentioned many times that it was Mercury based. I believe he even said it was pulled in the 60's. I think he even said he would admit what it was if someone ever guessed it. You can often see a glass of "gatoraid" in his competitors room in pictures.
I'll give everyone a hint.....if you ever wonder why all his competitors have "stomach problems" from the diuretic, it isn't because of being dehydrated.