Support for extensions is finally ready!
Remember the last poll? Python was the preferred language, and… we didn’t choose it. With a lot of grief, and after a lot of experimentation, JavaScript has proven to be the best choice for packaging and deployment of the extensions. Sorry.
You can already find a preliminary API reference and a tutorial on how to write an extension.
But remember: It’s still an alpha feature! A lot of methods are missing in the API, so suggestions about methods you need are welcome (here).