Some things in Final Fantasy VII will be really fucking weird to see updated to modern standards.

RedXIII dressed in a Shinra outfit springs to mind.

Barret's potty mouth, Aeris' death scene, Cid's attitude towards Shera.

This

How about the original battle system?  That would be swell.

Same. It will look glorious!

Cloud crossdressing.

In all seriousness, this quest is the point in the story where we'd see how Squenix is able to reconcile the gritty, realistic, silly, and fantastic elements of their story. You know, because we're playing as a super soldier crossdressing to sneak into a crime lord's base. I want to see how they pull it all of at once.

It wouldalso be the point where we could see a bunch of alternate models for Cloud. Will we actually see Cloud get prettier if we do better? Will we be able to dress up as Lightning Farron, and complete the circle started by having her dress as Cloud?

Other parts will be pretty, but this is the part that sounds innately interesting.

I'd say the Honey Bee part, if only for the fap material.

Though, something that will really be interesting to see is how they remaster the Gold Saucer and all of its minigames. Hopefully, they flesh them out a little more so they seem like quick indie games.

I don't know. I'm trying to keep my expectation in check because i know it won't be what i wanted, wich was just a graphics upgrade. With this full remake thing, i don't know what to expect. May be good, may be terrible.

Riding the dolphins.