The important first step for media support in core just landed in Drupal 8.4.x: a new beta experimental Media module to support storing media of various types.
We are modernizing our JavaScript by moving to ECMAScript 6 (ES6) for core development. ES6 is a major update to JavaScript that includes dozens of new features. In order to move to ES6, contributors will have to use a new workflow.
A number of issues indicate that Drupal's core IA could be better, and solutions proposed range from isolated fixes to totally restructuring the admin menu.
At major Drupal events when various interested parties are in attendance, we usually organize meetings around a few key shared interests, to ensure we are on the same page and make progress on important areas for the benefit of all.