Update: Plans in Drupal-land have shifted towards Create accessible markup for a drag & drop file upload widget (and ensure there is an accessible alternative interaction) and the original issue slated for D8 has been closed in the meantime.

Original request

This is a follow-up to #1380, the respective issue for https://www.drupal.org/node/2113931 and part of #779

Here's what they ~are~ were aiming for in D8:

d8-file_field_redesign

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/1445
GitHub Issue #: 
1445