I'm hoping they take a path similar to FFIX and use many elements and characters from previous Final Fantasy games in subtle ways to awaken that old nostalgia. Yoshida has said that he wants to add more "Final Fantasy feeling" to the game, and I see 9 as a good example.

However, if we're talking about cameos, I'd love to see Biggs and Wedge type characters, moreso I'd love to see Phoenix incorporated somewhere in the 2.0 version as a sort of mascot.