I think it's been confirmed that it's Fire/Psychic
Well, no, it hasn't.
I know many people will jump to tell me that since WPM's source was right about the existence of Fairy type and it being SE on Dragon the leak is pretty much confirmed.
Except the same leak claimed Dark to be weak to Fairy, and judging from the trailer where Gardevoir uses a Fairy type move on Hydreigon, that seems to be unlikely. Thus, we can't assume that all of the leak is accurate.
Only way I would consider it confirmed is that some official source tells us Fennekin's evos type.