I don't follow these things as closely as I used to, and it may have been discussed recently. If so, please point me to the right thread.
I'm very interested to try PVW 15yo that we are reasonably sure won't have Stitzel Weller in it. Have there been bottlings yet that don't contain any?
My guess is that there would be a weaning period where SW barrels would be used in ever smaller amounts at ever greater ages until it's all Bernheim/AAA barrels, but that's just a guess.