I talked to a VP of Marketing at this years whiskey-fest and he seemed pretty open about where it came from. Also mentioned that there is no other 13-year old rye on the market except for VWFRR and that LS&B has enough stock to last into next year release. They do plan on selling a 15 year in the future...I said "Of course at a higher price" and all I got was smirk and a nod.
FWIW, the rye was good but not $125 good. I drank a lot of whiskey that day though.