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Justifications are as follows:
Azumarill and Wigglytuff evolve from confirmed fairies.
The CleFAIRY line doesn't really have anything tying it to the normal type, I doubt they will be Normal/Fairy.
Snubbull is the Fairy species.
Azuril is weird as fuck so who knows how Game Freak will troll us with its typing.
Igglybuff might stay pure normal.
Blissey and Togekiss have an angel motif, either both or neither will be fairy.
Mawile Steel/Fairy has been a popular "leak" from Pokebeach's mostly correct source.
Plusle and Minun are boring and in the Fairy egg group.
Rapidash is a unicorn and unicorns tend to be associated with fairies.
Mismagius is a witch and fairies tend to be associated with witchcraft.
Ralts/Kirlia probably won't be Psychic/Fairy since they have a split evo.
Cherrim is the most likely candidate for an existing Fairy/Grass typing (but it's a long shot).
Audino = Sound Pokemon = Normal Type
Chansey, and Happiny all have nothing particularly fairy like about them.