[Illusion]

It's going to be a Fire/Psychic, one of the leaker's confirmed that the secondary typings of the starters would be Grass/Dark, Water/Fighting, and Fire/Psychic respectively. (Same person who revealed some early X and Y details.)
That and I wouldn't find it too surprising regardless because Gamefreak tried experimenting with Dark/Fighting/Psychic pokemon as starters during the (I want to say 3rd gen...) 4th gen.

But seriously the game is out in a month and we still haven't seen the Starter's final evolution yet. IT'S BOTHERING THE F**K OUT OF ME!