While the mentioned lack of clarity regarding how REST API evolves as project for the time being, there's also been an important event for WordPress last year, which was the release of Calypso—the so-called new WordPress.com, which is a single interface that will let you manage all your WordPress.com or JetPack websites. That interface will definitely bring improvements to everyone who has their websites hosted on the previously-limited WordPress.com platform. Calypso works as an entirely new application that will create interactions with your site by using REST API, and will be available to everyone with a website hosted at the .com version of the CMS or anyone who has the Jetpack plugin installed.
Calypso will pretty much let you do anything in regard to your content and some minor site edits and changes, with the exception of customizing your theme, but the limitation is not that great given the innovation in remove control and speed that has been brought...