More specifically, Lightning will show up in XIV as part of a "Full Active Time Events" battle, and players can score some gear modeled after those in Lightning Returns afterwards.
Lightning Returns: Final Fantasy XIII on the other hand will include clues on how to acquire the Miqo'te costume, and will also feature some Final Fantasy XIV: A Realm Reborn-themed weapons and shields which can be picked up during side-quests.
Take a look at some of this collaboration below in new screens for both games along with a video of Lightning's arrival in Final Fantasy XIV.
FINAL FANTASY XIV Meets LIGHTNING RETURNS trailer:
FINAL FANTASY XIV collaboration screens:
Lightning Returns: Final Fantasy XIII collaboration screens:
Lightning Returns: Final Fantasy XIII is scheduled to be released on February 11th, 2014.
The world of Gran Pulse is sinking into the sea and what remains is now called Nova Chrysalia. With only thirteen days remaining until the end of the world, Chaos reigns in a world that never ages. New life cannot be born. People need salvation. As Lightning, it is your mission to save as many souls as possible so that they may be brought to the new world. Along the journey, you will encounter familiar faces and engage new foes in all new lands. You must ultimately choose which souls to save and which to abandon and fully understand Lightning's true destiny. It all ends here.