Sounds like the specialty holiday beer from last year which was sold in the large bottles with a couple of glasses. The beer was indeed too much vanilla flavored but the glasses were top notch. Even passable for bourbon drinking.
As for aged "on" bourbon barrel oak, I'd think they probably did with barrel staves what they usually do with the beechwood chips for Budweiser, which is to line the bottom of the aging drums with them and added the vanilla beans as well.
As a mass producer you have to give them credit for trying though the tastes I've had of many of their "specialty products" has been less than favorable to my palate. If I'm going to drink an AB product, make it a Michelob Amber Bock.