What has materially changed upon graduation?
I haven't noticed any changes to the course since it has graduated from Beta.
I thought there was a slightly different tree being developed and that upon graduation it would be available on mobile. Are these still coming soon?
What's happened exactly that confirms it's graduation?
The point is not that something changed the moment that the course graduated from beta (mobile version was out before that happened). The point is what happened in the time between beta release and graduation. Hundred of alternatives were added, numerous problems were solved and new sentences were added. That's why the course has graduated, because it's now considered "stable. Also, we can now also start thinking about a new tree, that has more skills etc and less problematic sentences. ;)