That could be it indeed. But I guess Arcadia has altered their schedule before with this beer. They used to only bottle it every other year. But after opening their new location in Kalamazoo, they started brewing it every year.
You know something, I was at their Battle Creek location just last week too. I know last year's bottles were initially wax topped. But not many. They then moved to foil topped for the majority of the bottles. When I was there last week, they had maybe a case or two left for sale, and they were wax topped. Now I didn't think they were 2015 bottles for a couple of reasons. First, they haven't had their anniversary party yet. Second, typically this is a slow seller. Not sure why...other than price. If it had just been released, I would have expected to see way more available at the brewery. (Unless they brewed less this year.) Also, it was sitting right next to a couple cases of last year's Bourbon barrel aged Loch-Up, which no one really liked. So I was totally assuming "Last year's" batch when I saw them sitting next to each other. The only difference was they were wax topped. Another thing is when they released it last year, the local Battle Creek beer store had a shit ton in stock. So much of it that they made a floor display if it, rather than putting it in the shelves. And it was available for months. I haven't seen it in the shelves the last couple weeks I've gone other than a couple orphaned bottles that appear to be left over from last year.
This is one of those times I wish they had dates on the bottles.
I'll try and swing by the brewery tomorrow night and see if I can get an answer from them.