Apparently it is Serebii-confirmed, whatever that means.

It appears that after years of neglect Medicham might as well return to glory never seen earlier in its career.

Medicham is likely to get an honour of being the only Fighting/Psychic Pokemon to be granted a Mega-evolution, which will make it into a second Mega-pokemon with this typing alongside Mewtwo X.

Any confirmation of it? Would really like to know.

Rest of list:

Pinsir
Jynx
Scizor
Houndoom
Tyranitar
Heracross
Medicham
Banette
Latias
Latios
Swampert
Mew
Sableye
Kecleon
Aggron
Minun
Plusle
Sceptile