On Friday 18 June 2010, Jeff Ortel elucidated thus:
The 0.4 release is mostly ready to go out but I'm not completely happy with the 'plugins' API. I can either release as is with the caveat that it /may/ change. Or, I can wait and get it the way I want it first.
Since the plugin feature is going to be a "big deal," I would lean toward getting it right. You certainly want it to be well thought out, clean, and easy to use. Releasing a poorly implemented feature gives a project a bad reputation, and maybe worse: give the feature a bad reputation, which means it will be used less or not at all.
We'll wait. I'd rather have a feature that works well than one I have to hack around to get it to do what I want.
j