Encounter atop the Sky Pillar...

I think it's gonna be hella awesome! I expect awesome graphics, maybe a small cutscene (or at least, I want a small cutscene) and an epic battle.

 

I expect there to be better graphics.

Actually, in all honesty I'm not 100% sure we'll go to Sky Pillar for a Rayquaza encounter. Maybe he'll swoop in from the sky or something. SP was kind of a lame place for Rayquaza to hang out, in my opinion, so I'm hoping for something cooler.

 

Amazing 3D cutscene, epic battle music, a great climax where you climb to the top of the tower, where the legendary Pokémon is waiting for you... It will be awesome

 

It's probably gonna be one of the highlights of OR/AS, I mean come on, it was already amazing in R/S/E and now it'll be in 3D

 

I expect some sort of huge confrontation of Rayquaza. After all we need to find out why it isn't Primal.

 

There might be a crazy battle scene like Xerneas/Yveltal had, except this time with clouds in the background, maybe something like the Sky Tower from the original PMD games perhaps.