They are Pokemon customisations for all Pokemon: Hair/Wig, colored clothes abd bows which can be duplicated.
A female Charizard will have a change. It will have a pink bow on her head that looks like Charla.
Mega Evolutions (with new ones) and Z-Moves would return.
New Dragon and Steel Eeveelutions would be new.
A PC app would appear in Rotom Phone.
Let me know in comments that the rumors are fake or real.