How to enable inline editing on Views in Drupal 8?
Quick Edit of nodes in Views works. You can see this on the frontpage, which is a View.

However this works only for Views which show content.

If you have a View which shows content and want to choose the fields and customize the layout, you can create a custom viewmode, configure the fields there and put the layout in the twig files of the view mode.

Of course this does not provide all features of a View which shows fields and the module Editablefields. For this you would have to wait until this module is ported to D8.