Board Thread:Naruto Discussions/@comment-25051328-20140818021248/@comment-25028454-20140818171121

I'm starting to believe that when they mean by awaking both eyes, one will be the Amaterasu (since Uchiha are fire users) and the other is the MS user's special ability in Sasuke's case Kagutsuchi something no other MS user can do. And Tsukuyomi is Itachi's special ability along with that Sealing sword of his.