Outside the Episode: Ardyn in March, there realistically shouldn't be any other updates, it's likely going to be just as long/ big as Episode Ignis/ Propmto anyway. They probably showed us at least 75% of the cutscenes from that one trailer. In regards to the updates to the game there is only going to be one more time that they do a patch for FFXV and it's only likely going to be the compatibility patch for the Episode and that's it. I could see them throwing in in Deathgaze (since they reworked the model), like how they added Melusine. Unless they do some sort of farewell/ thank you for the support patch consisting of content that was basically complete but just needed polish like the FFXIV and Terra Wars collab but that's setting ourselves up for disappointment. Unfortunately the game is "complete" (which was Tabata's words after the Royal Patch) at this point so there is no reason for them to add anything or give us updates.
Honestly, this installment has been one giant train wreak, and I'm happy it's over. It started with changing directors, which made the story disjointed, to then having a situation where a lot of digital assets were created that remained unused (story scenes that were shown in trailers, the Dawn Trailer, that train station and Shiva dungeon part that was supposedly close to being finished but was cut, weapons, gameplay mechanics, etc. Like this rivals FFVII's debug menu, which has a ton of unused assets.) or separated (Platinum Demo, the festivals, and now Comrades) and never integrated into the main game. Instead 60% of the games content is a copy and paste job. And part of it just seems likely laziness, considering now we see how FFXIV and Terra Wars Collab have been added to the main game. For instance I was thinking about the Platinum Demo. Like how hard would it have made this into a sidequest integrated into the game that results in obtaining Carbuncle, rather that it just becoming junk content? I can see the scenario. Noctis falls one of the forests, wakes up as child Noct like how the Demo starts, take out the buttons that change the weather/ into animals, add in one or two cutscenes of Noct and Regis together, maybe Luna, and change out the Iron Giant to something else and you have a viable segment to the main game. Or The Chocobo/ Moogle Festival, why couldn't that be/ remain the main game? It could have been an option when you slept in the hotel in Altissia and actual story elements could have been added. An example being after completing certain tasks results in you going to meet Luna in this dream state as the reward. Instead it was content that was made, man hours put in to do it and now it's thrown out, never to see the light of day. I'm ranting at this point but the mismanagement (both from Tabata and Upper management of Square) just irks me. I want the Square prior to Sakaguchi leaving, the one that was the actual art house making interesting content. Mind you I like FFXV, I just wish it was handled better.