It doesn't matter what language it is, it should just be there for those of us who want to go into this fascinating industry.
Have you voted on the course poll? I believe there are game design courses being suggested there.
Now that you mention it, and I have been wanting this course for quite a while now; Swift would be great at that. It's basically a mix between all the really good languages, taking the best parts of programming and using them.
Well, voting for a course over on the poll is the best way to give your opinion on what should come next. All votes and suggestions are taken into consideration, and a lot of people have requested game courses, so I'm not sure exactly what's happening, but like I said, go vote there and that's all you can do right now
I actually just did that yesterday.