Really? I see it as another version of Dragon, or Bug.Especially dual-type moves, I really don't see that happening anytime soon.
I am quite disappointed by the name Fairy-type though, it just doesn't fit in with the scheme of the other types. Not just because I have never seen a type chart with it, but more because the entire theme seems bizarre. The closest to being an odd type is Steel, who ended up fitting in our competitive mons really well. I wonder if Light type might have been a better name, but w/e. This has the potential to make it or break it for next gen mons.
On the topic of Fairy type, assuming just a resist, Azumarill now forces most Dragon types not named Kyurem-B to run a new coverage move or be defeated. I went through my calcs somewhat quickly, as it's late where I am, but it seems that Azumarill can switch into most Dragons without a care in the world. Even without a good physical Fairy STAB, there's always good ole Ice Punch. Now, if Azumarill (and, by extension, all Fairies) had an immunity to Dragon... That would be insane. Sure, the OU Dragons (The ones who would be OU next gen) may not drop, but you probably wouldn't be seeing one on every team, as now you can't slap one on to improve synergy anymore.