Final Fantasy XV Development Manager Daisuke Oe has revealed that the December update will include a patch that will let you swap between Gladiolus, Prompto, and Ignis seamlessly during the game. Each character will retain the moves and abilities found in their respective DLCs.
Patch 1.1.0, which will be out on December 12th, will also include Time Limited Quests, and a load of bug fixes for the multiplayer portion of the game. Epsiode Ignis will also be released at the same time.
In other FF news, Final Fantasy XV Pocket Edition for iOS and Android has been delayed until “winter”, so expect that some time early next year.
Source: RPG Site