We have build a prototype that explores how the Blocks & layout initiatives it's ideas could look in Drupal 8. This following the page & component library and concept model discussions.
We have been struggling to come up with a UI that meets the many use cases this system has to cater for. Members of the UX-team, the SCOTCH initiative and many other members of the community have discussed heavily in the past few months to get where we are today.
We build a Prototype.
We still have a long way to go before we get to a level that is core worthy in terms of user experience, but we feel by doing prototypes and usability testing we can build towards a solid proposal.
We are really missing feedback on this proposal, so we would love to hear your thoughts and ideas on how to make it better.
Join the discussion on g.d.o at http://groups.drupal.org/node/242403