Edit: I forgot about Hard Mode and the stat-changing magic. Hard Mode seems really likely if they were going to add in anything else, especially after the reworked Ifrit fight in Comrades.
According to Sylva, and a few others that have been messing with things on the Reddit FFXV Discord server, there's already established flags for a hard mode in the options and save data. It's just not functional. Apparently that's the same thing with Lunafreya's combat and/or player data being partially done too from what Sylva's mentioned to me. He said they modified Lunafreya's files as well with the last update.
Majority of the recipes thus far have been what was available via the Assassin's Festival (Semur Skewers), and now the Moogle Chocobo Carnival with the two recipes from that now being available in Altissia. If anything was to be fanservice for the Ignis fanbase, it would've been his hair-down hairstyle being added after six months of requests from the JP and international fandom.
I will say, it was a bit late because one of the FFXV moderators actually had it modded in with both the younger, older glasses and functioning across all of the other costumes, with a correction to the broken shaders on his hair too for a couple of months prior to Square choosing to finally release it alongside the Mod Organizer. The official one is kind of pointless, because from what the moderator wrote down they never bothered to prepare the programming for Older Ignis to have the Casual Crownsguard, or Wild Crownsguard hairstyles so it ends up defaulting to his older hairstyle. Not to mention, the shader problem wasn't addressed either.
They still didn't fix Ignis' 4K textures being broken, and despite updating multiple files in Episode Ignis, Ravus is still completely broken. Can't actually heal you in Episode Ignis, but Ignis still responds as though he's being healed. Ravus' animations for healing also won't play overall.
It's been broken since January-February on PS4, broken on launch with the Windows Edition.
Sylva said they haven't really modified the contents for Comrades so far, and that there's a few thousand mod item entries. So while they've said there's no limit, there actually is from the files apparently.
I think lack of news is being felt all about the community, especially since a lot of the players that have been interested in the XIV / XV collaboration have been disappointed with E3 announcing the new Monster Hunter one... instead of giving us an update on one that was already announced over a year ago.
Given how we had that news drought prior to Royal Edition too, it's a bit sad when it seems as though it's up to people digging like Sylva to bring anything potentially of interest up. I don't know, just how I feel about the matter.