Tabata talked about plans for the future of Final Fantasy XV, which will not be ending with the shipped game or even DLC. As already seen with the Crown Update, in addition to the planned paid DLC, there will be updates to give new content for free to all users. They have three stages of plans, short, medium and long term plans for the game. Some of those plans include, improvements to chapter 13, new cutscenes to expand on characters, new playable characters, a new game plus mode, low level lock feature, invincibility mode for those what want god mode, limited time hunts, new bosses with new rewards, improvements to the font readability and even talking about possibly customizible avatars, which would be a first for non-MMO mainline series.
Source: Final Fantasy XV Aiming to Add Custom Character Creation in a Year of Free Content Updates - IGN