I am sure people will be shown in chronological order from the start of the SH crew journey up to the admirals/ID.
Aside from the obvious ones like the hometowns in east blue, drum kingdom, alabasta, and water 7 I also predict/hope for these:
lola pirates
CP9
dragon and iva?
mihawk
shanks
moria
crocodile & new crew
smoker/admirals
I really want to see magellan and hannyabal.
the fuusha village one didn't show Dadan an her group, which is kinda disappointing. Also I'm not sure if characters in the NW will be revealed yet or not.