I have japanese sources but I DON'T KNOW IF THEY ARE RELIABLE !
They were reliable once when talking about a "mega sableye with a big gem" but they told me some fake things so I don't know about the truth of the upcoming "leak"...
so I'll post what they say to me about the corocoro and we'll see if it's true or not.

>Brawly and Norman are redesigned.
>Brawly have short hair and some kind of diving clothes
>Norman is pretty much the same but he has a costume.
>Mega Sharpedo is Water/Dark type with the ability Strong Jaw. He looks like a torpedo and is more dark colored.
>Mega Camerupt is Fire/Ground with Solar Power. He is Dark red With little rock all over his body
>Professor "Hayato" is the master of the "Over Lab" a mini-game feature where you excavate a red stone to get fossils or something.
He is trying to understand what is "Primal pokemon"
>Mega-Diancie's Stone is an event of this lab when you show Diancie to him.