Matt Mullenweg makes it clearer.
Calypso is a new js-based, single-app. admin application that talks to the standard WP back-end via its ReST API. And it’s open-sourced.
Brunet thinks it’s not going to affect free WP users. Maybe.
What would, I think, be a radical move, would be to recreate the PHP model with node.js.
Did WordPress just translate itself to node.js?
Big question, will they also open-source this code-base for users to host on their own sites? If so, this is probably the beginning of the end for PHP? WP is certainly the only PHP application I run. And probably the most widely used PHP program in the wild. (Not counting FB here.)
If they aren’t going to open-source it, is this the beginning of the end for WordPress as the world’s most popular Open Source social-software? Is WordPress.com going to try to turn itself into a more closed, “gated” community? With new features only available to users hosting within it? Is it going to become more like Tumblr … or Medium or even FB?
Update : It’s all open-sourced.
Deciphering Glyph : Your Text Editor Is Malware
Worth a listen : Podcast: What’s going on behind the scenes at Scripting News