Was told rather late that this was on the special tap, and I had to order it. I don't know if it's the age, or if I've gotten more used to funky sours, but I did enjoy this a lot more than I did the 2012. It's still not super-tart, with some mild, vinous funk and some evident booze. I think for sure this was the most interesting beer of the night, so I'm glad I found it.
... and then, a crash. There's a lot of funky yeast action going on in this beer, vinous and mushroom-like, but not with any of the (lucky?) elegance of, say, a Pour Les Oiseaux. If I've ever had a funky blue cheese of a beer, this was it.