In reply to William Earnhardt.

@Zebulan - it's been implied in the State of the Word address and in podcast's Matt has appeared on.

WP-admin will eventually be replaced by something built with React. Unless someone else comes up with a better alternative (unlikely, given the resources required), then it's likely that'd be Claypso.

State of the Word 2016: Mullenweg Pushes Calypso as Future of WordPress’ Interface, Proposes Major Changes to Release Cycle