Based on this DLC Road-map, it looks like I'll schedule my replay og FFXV in the Spring next year after all four Episodes come out, but I'll only include Ardyn and Aranea's Episodes for my playthrough, in addition to the Season 1 DLC Episodes, as I don't think Lunafreya's Episode is needed considering where it might be set, and Noctis' Episode will definitely not be included since it's alternate, here's my chronological order I might play FFXV in next year.:
Episode: Ardyn (Acting as a 'prologue' of sorts, setting the story up 2,000 years ago.)
FFXV: Chapters 1-8
Episode: Gladiolus (Play in Chapter 8 at a campfire.)
FFXV: Chapters 9-10
Episode: Ignis (Play in Chapter 10 after arriving at station.)
FFXV: Chapters 11-12
Episode: Aranea: (Play after meeting Aranea in Tenebrae in Chapter 12. This is subject to change depending on what happens.)
FFXV: Chapter 13 (Both Verses one and two.)
Episode: Prompto (Play in Chapter 13 in a rest room after rescuing Prompto.)
Chapter 14 (With Royal Pack DLC to finish things off, and I may play the final scene from Episode: Ignis, Noctis and Ignis' conversation at the final campsite, just after arriving in Insomnia.)
As for Comrades, that's up for debate.
@Vankwisha Yeah, we need clarification, it's vague at best, but at least I'm taking Ardyn and Aranea's Episodes for my replay next year for FFXV to get the complete experience.