Missed this one.
So the new type of summoning is called Pendulum summoning.
Requires two monsters. Nothing else about it yet though.
By the sound of the name I guessing some sort of back and forth switching between the summoned monster and the monsters used to summon it.
I hope it's new maindeck monster
No, Pendulum monster go to the extra deck and you and you have to send two monsters from your deck to the graveyard to summon them.