v.0.99.42 seems pretty stable to me, and I've been told that there shouldn't be any major feature changes that would affect Platform School between now and 1.0, so I'm starting work on fixing and finishing the tutorials.
I'll be updating or even re-writing entire sections to reflect changes and new features since v0.98.9. I'll also be expanding on certain topics that some people have said weren't entirely clear. I'm even going to change some of the basic event structure, since I have discovered more efficient methods in some areas (such as handling player controls and animations).
Don't expect anything right away, though... I have a lot of work ahead of me.