The Duolingo Indonesian course has a launch date now: August 17, 2019. I've been waiting for this one for like 4 years. LOL.
I just returned to Duolingo after almost 2 years. I am finding the new "crown" system to be pretty loathsome, unintuitive and unhelpful. Sadly, resources for Indonesian learning here in the US are still pretty scarce so we may be stuck with this for a while.