Yeah. That's a damned shame, and it came as a complete surprise to some people, lol. They ordered the coat before the site had been updated to show the nylon, and when they got it, they found a pleasant surprise on the tag.
I think that it was absolutely worth it last year, but if I had to buy it from the second run (or whatever run they're on now), I'd probably be hesitant. They started using black leather almost immediately after the first run.
The charcoal is 100% wool. The navy and the yet to be released black are 80/20. I just received the charcoal in a size large. I'll have to post my impressions and maybe some pictures soon.