I've updated the Language Model doc at http://cr.openjdk.java.net/~briangoetz/valhalla/sov/02-object-model.html
to reflect the discussions surrounding abstract class supertypes and their use as reference projections, as well as the `ref-default` modifier. Original version available here for those who want to try and diff them:
http://cr.openjdk.java.net/~briangoetz/valhalla/sov/02-object-model_01.html
