Lightning’s English voice actor, Ali Hillis, has posted some interesting news on her Facebook fan page.
“We have wrapped [up] recording on [FINAL FANTASY XIII-2.]”
It’s probably safe to assume she means the full game, as she finished her own lines some time ago. Aside from working on Mass Effect 3, she has hinted at working on a secret upcoming project. This could possibly be a future Square-Enix game.