Duolingo can teach Klingon???
THIS IS WEIRD. THEY TEACH STAR TREK LANGUAGES!! WHO IS GONNA TEACH IT...COMMANDER WORF?
Yes. And it most likely will when the Incubator is released on a full scale.
Well, it is said that you haven't really experienced Shakespeare until you've read him in the original Klingon.
Check the twitter page. They most likely will. It might not be the most profitable language, but it would pull others to the site that they originally wouldn't have. Now, I don't think they'll open it up to personal conlangs, but I can see them opening up the tools to Klingon, Quenya, and Na'vi.