There's not really much to leverage out of the consoles though as they are using x86 architecture, unlike previous generations where the consoles had unique architecture to the consoles that required a longer time to really get the most out of them as the developers needed to learn how to optimize various things.
I think the curve this time around is just with developers who haven't worked on more graphically involved games, take a look at the jump from 2D to 3D with Square and see how FFVII looked and how FFVIII/IX looked, there's a big jump.
This generation things are focused not only on higher resolution and graphical detail with textures and models, but also with things like lighting, particle effects, and a slew of other details just for visuals alone. One of the bigger things for FFXV is going to be the physics. I feel that they will be a very important part of combat and the game overall. Different weapons have weight to them, and fighting different enemies will feel unique depending on their own strengths as well, should be a lot of fun fighting enemies in this game.
Judging from what we've seen, I wouldn't say it looks like an upgraded PS3 title, as the particle effects and lighting look great so far. However, I understand what you're saying. I would look towards the announcement trailer to see what the team are looking towards emulating with the final graphics only with more polish of course.
I'm looking forward to how the game progresses, and of course, looking forward to E3 as the game's next appearance, but only time will tell, luckily it's only just around the corner!