On the Noupe.com site they've posted an article talking about the WordPress REST API that's been included by default in the project and how it will affect developers on the platform.
With the advent of WordPress 4.4 last year in December, we saw the inclusion of the first half of REST API in the WordPress Core, and the rest of it is expected to be with us in the upcoming major release of WordPress. [...] The community is abuzz with all talks about how important REST API will soon be for WordPress development, and how it is going to change the way developers code and interact with WP.So, how is REST API going to affect the WordPress users and developers, and what exactly will we be able to accomplish using it?
In the article they talk about the impact that the API will have on the "rise of Javascript" in the WordPress application and the role PHP could play in it all. They also talk about cross-platform integrations the REST API makes possible, the Calypso interface that was recently announced and how it opens up a new world of mobile application possibilities.