I was having some fun speculating over which Pokemon could be  re-classified as Fairy type, if it indeed turns out to be a real type.  This is nothing but speculation of course, feel free to add a Pokemon  you think might be another good candidate, or argue with my choices, or  whatever. I'm really curious to see what will happen if this rumor  really turns out to be true. I kind of hope that it does.
   
		
		
	
	
This one is fairly obvious. They are the 
Fairy Pokemon,  after all, if it didn't happen I would be surprised. Adding Fairy as  their secondary type would give them two immunities (Ghost/Dragon) and  expand their movepool, but it would add a poison/steel weakness, giving  them a total of three weaknesses, which isn't so bad. It's really  impossible to say how their typing would affect their place in the  metagame without seeing what new moves and abilities they will get, not  to mention what the addition of 100+ new Pokemon will bring, but I can  see the type change really benefiting Clefable, no matter what tier she  ends up in.
		
	 
This  one may be a bit of a stretch, but something about Mr. Mime just  screams Fairy to me. Psychic/Fairy would be an interesting combo;  Fighting types would cower in fear, Poison and Dark types, though their  attacks would still be super-effective, would have super-effective Fairy  STAB moves to worry about, and Dragon types would be hampered by the  double whammy of a 2x weakness and Dragon immunity. I really don't see  Mr. Mime going anywhere regardless of how his type or the metagame  changes, but you never know. He could even gain an evolution like first  gen brethren Magmar and Elektabuzz did in gen 4.
   
 
 
These  guys have been OU since the beginning, and I really don't know how a  type change would effect that in a totally revamped metagame. Additional  weaknesses would hamper their effectiveness as walls, but that added  Dragon immunity is a nice bonus.
 
This  HAS to happen. Finally, there will be a reason for Dunsparce and his  useless little wings. He might even gain an evo out of the whole deal,  but honestly, I kind of prefer him as a stand alone oddity. Not every  Pokemon needs to shine competitively, and who wants to give up laughing  at Dunsparce?
  
These  oft-forgotten guys deserve a little time in the spotlight, don't they?  Like the Clef line they are classified as Fairy Pokemon; it would be  wrong to snub them. Get it? 
Snub? Snubbull? Ok, I'll leave.
 
Since Gallade turned out to have a secondary Fighting type, Gardevoir deserves a secondary type, too, and she looks the part. 
If  the source providing this info is indeed accurate, then we already know  that Mawile will become Steel/Fairy. Since Steel is immune to Poison,  Fairy types Poison weakness will be negated, which is a plus. Steel will  also do neutral damage instead of super effective damage, seeing as  Steel resists itself. It will retain it's weaknesses to Fighting,  Ground, and Fire, the latter really giving it a hard time as it would  resist both of it's STABs. Maybe Sableye and Mawile will get evos this  gen? Both could be pretty kickass with some boosted stats and new moves  and abilities to play around with, though Sableye really couldn't ask  for a better ability than Prankster. 
 
		
	 
Another  one that's kind of a stretch, but not really. If it does happen,  welcome to OU, Milotic. Milotic would gain super effective STAB against  Fire, Rock, Ground, Dragon, Dark, and Fighting. Steel would do neutral  damage to it because water resists steel, leaving it with only one extra  weakness, Poison. Poison attacks are rare in OU to begin with, so this  would not phase Milotic much unless some more powerful Poison type  Pokemon and attacks are introduced in gen 6 to help balance fairy. It  would gain an immunity to Dragon, as well as resisting Steel, Fire,  Water, Ice, and whatever Fairy resists, if it turns out to have any  resistances at all. Fairy attacks are not very effective against Fire,  but Milotic being a Water tyoe would negate that. Milotic has good stats  to begin with, so giving it a boosted movepool and a heap of extra type  resistances and advantages would make it a really top tier Pokemon,  especially on rain teams (assuming that people still use weather by the  time gen 6 rolls around).