It's always interesting to see what developers initially had planned for a certain game, especially one as big as Final Fantasy XIII-2 .
Some fans have been reading up on the stuff that didn't make it into Square Enix's latest RPG production, thanks to the Ultimania Omega book that has offered plenty in the way of behind-the-scenes details .
Firstly, the game was supposed to be a direct sequel to FFXIII, taking place 900 years after the events in Lightning's first adventure. It was during the creation of the back story for this plot that the developers decided to implement time travel. There's also some information on the complex relationships between Caius and Yeul, and why nothing romantic happened between Serah and Noel. The latter should be obvious, though; they both had other love interests (Snow and Yeul respectively).
Then there's the canceled DLC: Originally, Snow was going to have a motorcycle mini-game, where he'd ride through the Archylte Steppe bashing monsters; he'd be able to spin, drift, and jump, and he'd even have a "water spell." Another piece of extra content that didn't make the cut was one for Hope. It would've been "an adventure type game using the Live Trigger system in Augusta Tower." The goal there would've been to keep Alyssa from killing Hope.
It seems there was a lot of content and ideas that didn't make it into FFXIII-2…maybe that's why they'll eventually give us FFXIII-3…?
Related Game(s): Final Fantasy XIII-2