Someone on the subreddit was talking about how they plan to make a high-end carbon fiber chassis for the 13. That was a few weeks ago - I don't believe they've posted anything since their initial post.

As a 13 owner (only thinkpad 13, nobody talks about it but I think is one of the best pieces of hardware I have ever owned) this would be fantastic. I would love to have my 13 for life. I don't know if my 13 is able to be upgraded like a desktop PC like other thinkpads, but adding a carbon fiber chassis would be like fresh air.