In addition to this, Blizzard has also opened two new Italian realms available for Italian-speaking players. If you've been wanting to play WoW in Italian, now's your chance -- you can transfer to either Pozzo dell'Eternità (PvE) or Nemesis (PvP). Because of the new realms, Blizzard is also offering players free character migrations.
Check the official post for details on installation of the Italian language pack as well as the free character migration. And while you're there, you can view the cinematic trailer for Mists of Pandaria in Italian, too.