This talk was a really complete overview of what will be plone in the next future and an idea of how it will be in the far future.
In plone 4.2:
Search results, new collections, theme editor, hml5, supports python2.7
In plone 4.3:
Dexterity, Syndication, z3cform for portlets, depends on pillow, jquery 1.7, removed kupu and kss
Proposal for 4.4:
plone.app.contenttypes, plone.app.event, plone.app.deco, plone.app.toolbar, plone.app.multilingual, configurable CSS class for portlets