I'ma going to guess that the first 3 parts of the game will be the raid series, as well.
I'm going to hope that the raid's lore will be worked into FFXIV's lore, more like Ivalice was, and less like the Nier raids, where it was like a scoop of grade school cafeteria Nier mashed potatoes being plopped on the tray that is FFXIV. I hope it's actually a bit spicier (only complaint about MotR was that it was roll face on keyboard easy) Gimmie TG Cid and Ozma difficulty, please. People will have played their job for 100 levels, asking for a little bit of competency would be nice.
It would be neat if you completed The Maiden's Rhapsody event, it would be referenced. Doesn't have to be a big thing, but it'd be cool.
Lots of orchestrion scrolls. Don't mind if there are remixes. If I want to listen to the original music, there's YouTube (plus I own the CD's of the first 3 parts OST)