Well, can't say I'm surprised, but I can't say I'm partially disappointed either lol.
But let's go through this:
Ardyn: Fucking awesome, perfect, exactly what it needs to be. Hopefully it takes place in some new locations in the past.
Aranea: I had a feeling they'd avoid changing the main canon of how the bros travel through Niflheim, but seeing it through Araneas eyes may be even better. Not sure how many locations we'll see, but hopefully she's present at LEAST for the Tenebrae Invasion and something in Gralea. More stoked for this "Side story" over the rest tbh.
Luna: VERY intrigued, but cautious about her story being post death. I guess it will explain where the fuck people go after they die? It may actually clarify the ending that much more. Hopefully some part of it has to do with before her death because GOD they can do so much there but I digress.
Noctis: ....tbh, I'm not sure what they are trying to do here, BUT it has potential if done right. That's all I can say here. I really hope that while it is an alternate take on some portion of the story, it is done in line with the main canon of the story. Maybe they'll actually play on the fact that Umbra can travel back in time? Being an alternate, epic, happy ending doesn't make it worse, I just don't want it to detract from the improved ending we do have.
I think this is why Ardyn, Luna, and Noctis are named 1,2, and 3 while Aranea is a side story. Aranea will be part of the main games initial story, effectively expanding the second half (That's my guess), while Ardyn and Luna will be 100% canon to the main story too, BUT will somehow allow Noctis to save both of them.
The above is honestly the only way I'd be happy with Episode Noctis. The other 3 are great, and I am definitely excited, but they have to justify why Noctis's DLC is even necessary. Like why is that going to "Complete FFXV"?