It may take a while.  They spent several years developing the Python course; they started uploading it over 2 years ago, and are not done yet.  (There are also mistakes in the transcripts of some of the JavaScript modules that were reported over 6 months ago but had not yet been fixed when last I looked, so they apparently don't have enough staff to fix the problems in their existing courses.)

My best guess is that there might be 1 new programming course every 10 years.