Quote Originally Posted by Hercub View Post
Question: when the cross over of 15 occurs, do I need to start a new alt to get the benefits of the new lore?
Nope, the crossover events always exist in their own little bubble with no direct connection to the main storyline, so you can enjoy the event quests regardless of where abouts you are up to in the game (at least, the two FFXI events, the FFXIII event and the DQX event were like that).

So, don't be concerned, there will be no need to make an alt to get the 'new lore' when FFXV's crossover event does happen, because it will not have any impact on the main story.