Question for the New Japanese Tree?
When the new tree came out, were there any changes to the older skills? Also, does anyone know when all learners will receive the new tree?
Yes, before the new tree I had 3 or 4 crowns on all the skills from Family through Nature. After the new tree most of those were back to 0 crowns but 1/3-2/3 complete. The progress wasn't lost, they just added material to each level for each skill. Some of that's new Kanji and new sentences, some is just extra repetition. When you complete one level on a particular skill you'd done before, it doesn't start at 0% for the next level, just whatever % of that level you've already finished.
Just complete what's missing and then get to the 5th crown so if anything other than the obvious skills has been updated you get the chance to review them.
There were some changes in terms of vocab, grammar, kanji, etc. It'll take a bit to regain progress, though. I can't say I know when the new tree will be available to all learners, but I'm guessing within the next few months.