The contributors are very busy so probably after they find the time which could be whenever, we just don't know. Glad you're learning Swahili!
Still waiting for it as well (for the audio). It probably shouldn't be too much longer; sometime last month, they wrote "We're hoping that the audio exercises will be available by the end of this month, if not by next!".
Even though it's in Beta you can still do the tree. I got the owl over six months ago.
It only came out on Feb. 20 ;)
Maybe they were an early tester though?
I'm enjoying the Swahili course, but would love to have the audio - when is that expected?
See my comment just above :)