Last week someone has faked to be me... And he said bullshits. Here's something I remember clearly

Speaking of the E3 new pokemon, the electric corgi becomes a greyhound, Impidimp a gargoyle

Leon's Charizard will have Gigantamax form. The starters, the legendaries and a witch mytical pokemon will have one too

Only Kanto pokemon have regional evolution, but i may be wrong. Pinsir and Paras get one.
And new steel eevelution with new move.

There will be a dragon gym and a fairy one near giant mushrooms area

Eternatus is dragon and fire type, but i'm not saying anything about him.
There will be cutscene in USUM style