* Support for package.mask, package.use, package.use.force, package.use.mask,
  use.force and use.mask as directories (bug #282296)
* globstar shell option enabled by default (bug #414811)
* REPOSITORY variable in ebuild environment (bug #414813)
* Repository dependencies (bug #414815)
* Support for make.defaults, package.use, package.use.force, package.use.mask,
  use.force and use.mask placed directly in ${repository_path}/profiles (bug #414817)

The code for these features already exists in Portage, so it would be sufficient
to update EAPI checks in some places.

-- 
Arfrever Frehtes Taifersar Arahesis