Trying the 2.3 beta on my personal site (no panel, blog-like, ten templates, a few tricks, search, Atom feed forked from the Feed Plugins), and so far nothing breaks.
I’ve started working on a Twig plugin:
Overriding components seems to be a useful approach but it’s completely undocumented and I had to spend my afternoon reading Kirby’s source code, which is instructive but maybe not all plugin developers should have to do it, I don’t know. Some thoughts on what could be documented on this side?