No it hasn't. Confirmed means Nintendo outright stated every single type matchup Fairy has, which hasn't happened.
EDIT: Direct from Pokemon.com: "How Fairy-type Pokémon and moves will fit into the battle landscape has yet to be fully revealed. But it is known that Fairy-type moves are super effective against Dragon-type Pokémon!"
Pokemon Black 2 FC: 1292-6017-5477 (Sid) Statement: Just a simple droid here, ma'am. Nothing to see. Move along.
Technically, nothing outside of Fairy being SE on Dragon is "on-paper" confirmed. Poison being SE on Fairy is practically confirmed since Pokemon Smash alluded to it, so there's that too if you want. But nothing else is confirmed; still, doubting any of those matchups is pretty foolish at this point.