The Fairy-Type is all in it's early stages. Currently, the Fairy-type is a nothing type. There aren't any known items that can increase Fairy-type moves or anything - it's all just a big mess the Fairy Type. xD
Since this is the first new type in nearly two decades, this is all very new to them. The Dark and Steel-types joined the Pokemon franchise with ease since there weren't any moves or abilities or whatever the heck that needed to be added, to make it look pleasing.
There is a good chance there will be a Fairy Arceus, with the Fairy Plate and such. They might re-release a Fairy Arceus as an event, or something. Due to this big release though, it might be like the ??? Arceus, where it may be only available over hack.
It's all very intriguing as to how this Fairy-type thing will work, and if they get around to Arceus - they might not. It isn't really confirmed at all, but there is a 90% chance they probably will add a Fairy Arceus.
Hope I helped. :)
(Sorry about the long answer; hopefully it's relevant xD)