Just started the Hawaiian course!
Here's my assessment of it so far. It currently only has 9 skills, and for some reason I can't access the 2nd lesson on the "Polite Expressions" skill. But all of that is understandable considering they just opened up the Hawaiian course and it's still in beta. I'm sure they'll fix the issue with the "Polite Expressions" skill and add more skills soon. I'm very excited about this course being opened today, since Hawaiian is one of the three languages - the other two Irish and Spanish - that I want to learn.
Well, like you said, there are only 9 skills, and not all of them are accessible. If this isn't a glitch, that means this is the real tree, and a tree this short is a joke. I'd much prefer a later release date and get a robust course with a wide range of skills instead of a 9-skill tree today.