Liferay 6 Release candidate is out. Liferay Portal 6 Release Candidate Released. Here are few screenshots describing overall improvements , new features.
Overall better navigation
Single Click access to add WCM Content , Assest Publisher , Search etc.
Sitemap -> Manage Pages
Page -> Manage Page
Page Layout -> manage the Page Layout , if page is created using a page templates.
Workflow Configuration, Page Templates , Site Templates , Custom fields.