The mint/dark chocolate must have been a success since they're adding a mocha/chocolate to the Duo line.
I saw Apple Pie Kit Kat while I was sleep-surfing the net, but not for purchase.

You mentioned Wilbur Buds upthread and if you've stopped at Lititz, PA, on a drive through Pennsylvania Dutch Country, you'll recall the aroma of chocolate in the air, all over town. Missing the last time we were there, I guess due to factory closing. Hope it's returned, as i read there was something of a renaissance happening. I think the Buds pre-date Hershey Kisses, but not certain.