Square Enix have released a video showcasing the Lightning cross-over in Final Fantasy XIV: A Realm Reborn. Lightning appears in a Full Active Time Events (FATE) and successful players are rewarded with gear and weaponry modeled after those in Lightning Returns: Final Fantasy XIII.
Some images from the Lightning content in Final Fantasy XIV: A Realm Reborn:
But there is also going to be some Final Fantasy XIV: A Realm Reborn in next year's console release (PS3/Xbox 360) Lightning Returns: Final Fantasy XIII. There will be Miqo'te costumes you can find and you will be able acquire weapons and shield themed from the city states of Final Fantasy XIV: A Realm Reborn (Limsa Lominsa, Ul'dah, Gridania) by clearing side quests.
Images of the A Realm Reborn content in Lightning Returns:
