Mew definitely has the traits of a fairy - small, agile and the stereotypical pink associated with the type. Though honestly, I think they'd just make a Mega Mew to counterpart with Mega Mewtwo and give it the secondary typing there. They'd probably leave the unoriginal mon untouched seeing its been out since the beginning and a type changing now would take some time to get accustomed to. But I digress since there have been countless changes come the new fairy type - including Gen 1 favourites such as Wigglytuff and Clefable. We shouldn't go overboard with making everything fairy/psychic though otherwise it'll lose its meaning.
Hmm, not necessarily true! I think Kalos could be seeing some mega evolutions soon, especially with the new fairy type. Maybe we'll see mega forms for a few of our favourites soon? I'd imagine a Mega Florges or even Slurpuff/Aromatisse. Though I guess they would want to work on adding mega forms to Sinnoh and Unova first but I think they could just combine the mega load between all three.
What dual type would you like to see with new fairies? (list 3)
Interesting! I think the three dual types I'd anticipate the most would be fairy/dragon, fairy/dark and ice/fairy. With fairy and dragon both being two of the most powerful types in the game, their combined power would be unbelievable. It wouldn't be hard to sketch or draw out a rough design either - we could always just have pinkish small dragons or very feminine-looking ones in general. I know that's an overdone idea but I'm more focused on how cool the battle potential would actually be. :D With the speed of fairies and the power of dragons, it'd be pretty hard to stop whatever dual type creation Gamefreak would design for this.
I think fairy/dark contrasting together would also be a nice touch. Putting two opposites together always creates an interesting result after all, as seen with things like Volcarona and Lanturn. Fairy/dark is just awesome, hands down. Though honestly the only thing I can think of is a darker-coloured version of Kyubey from Puella Madoka Magica.
However, I will say that there could also be dark pixies. Though that'd probably be in a MMORPG and not pokemon. Lastly, fairy/ice. Two types that both have elegance, grace and beauty. Who wouldn't want them together? The design would be overwhelmingly cute most likely and its performance in more aesthetically pleasing sort of things like contests would be amazing. :)