That actually looks pretty nice. I hope they take as much advantage as they can of the setting, although considering this is a short experience (going by Gladio's, which I assume will be comparable enough), I doubt we'll spend too much in the wild.
I mentioned a little bit about 13:2 in my Christian symbolism thread, but I'll put my more comprehensive reactions here.
Seeing Ravus confidently profess his faith that Noct is the True King who will save the world to an emperor who sees that title as belonging to him alone is far more satisfying than a traditional last stand could have possibly been. As much as he was driven by doubt, his death was a martyr's death.
...of course, that just makes what Ardyn did to him all the crueler. Ardyn basically threw Ravus' faith and his doubt in his face, ensuring that the last thing that he saw would be Noct mocking him for his previous lack of faith.
Ardyn having intercepted Ravus' letters to Luna is such a perfect explanation as to why they were scattered around his body... and a perfect twist of the knife. =(
Iedolas' daemon form actually looks... kind of gory up close. o_0; He's got horns growing out of his eyes, his flesh is reminiscent of exposed muscle, and there's red viscous liquid on his chest and arms.
I wonder where 13:2 is placed within Chapter 13 itself. I feel like it belongs between the "cliffhanger" of Noct falling from the bridge and him waking up next to Ravus' corpse. Apart from the obvious cliffhanger nature of that transition itself, I feel like knowing the truth about Ravus before reading the letters would better provide context for them, and revealing the nature of "Foras" before Noct runs into him would make that feel a bit more important, too.
To be fair, adding a shirtless Gladio costume probably took about as much effort as offering the choice of using the guys' older appearances in the past. His jackets and shirts are separate models, so all Squenix had to do was tell the game not to render any of them. XD;
Now, if they add swimsuits, that's how we'll know they're really listening to what fans want.