No worries. I just wanted to make it clear this is not a toe in the water. :-) > My understanding is this can be used as an interface to all WordPress blogs.

No worries. I just wanted to make it clear this is not a toe in the water. :-) > My understanding is this can be used as an interface to all WordPress blogs. Yes, that's correct. It works for WordPress.com blogs of course. But self-hosted blogs can also make use of Calypso by installing our Jetpack plugin (https://wordpress.org/plugins/jetpack/ https://wordpress.org/plugins/jetpack/) which adds some API endpoints that allow Calypso to communicate with the self-hosted site. > it is only steps away from peeling out the whole PHP layer for these interfaces I don't think I would go that far exactly. The php codebase is still there, and users can still use "wp-admin" if they prefer. And the API is also powered by PHP. But now that Calypso only communicates with a site through the API it allows us to separate the view logic and focus on making those endpoints as efficient as possible. I think it's possible the API could be written in a language other than PHP. But that hasn't happened yet and would be a significant task. I should probably mention I am one of the authors, if that wasn't obvious. :-)