Super Effective to Dragon (confirmed) Dark, and Fighting
Immune to Dragon
Resists Ice (and probably more, I forget)
Weak to Steel and Poison
Resisted by Fire and Psychic
Honestly, with a setup like that, I imagine most Fairies won't have very high stats. I mean c'mon, making them weak to the two weakest and hardly used types, having hardly any types resist them, full immunity to Dragon with quite a few other advantages in their attacks.
If Fairies don't end up being kinda weak, they're quickly gonna be overpowering, and then we'll have to wait until Gen 8 for GameFreak to release a new type to balance the Fairy out.
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Fairy is only confirmed strong against dragon, weak against poison (Poison weakness was pretty much confirmed in Smash unless Sylveon gets some ability that absorbs X type move, but takes 2x from poison, which is doubtful).
And no, PokeBeach's leak is not an 100% confirmation, nor is it a 0% confirmation. Absolutes do not exist when it comes to a series that once believed Mew lived under a truck >.>