Ok, I think I’ve figured it out; they have in fact reformulated the recipe. They’ve reduced the sugar by 10%, and added stevia. Since stevia is from a plant, it can be classified as a natural flavoring. There’s also pectin in the ingredient list, but that may have been there before. I wish I had an old can for comparison.
I also found out that product sold in cartons doesn’t have the foil tops, but other packaging does.
I knew there was something different, and the sugar grams were lower I felt than the slight downsizing would reflect.
ETA, meant to reply to @ChristinaM and @Thimes.
