It has 4K + HDR support. Tabata is talking about taking "full advantage" of Pro like with the PC version, things like redoing the lighting on top of the base features which they don't have time to do right now. For Instance, Uncharted 4 has already released and it's currently "undergoing retooling ('they're taking another look at rendering strategies,' says Cerny)" since they have time to do it.
We don't know what the 1080p mode entails for XV, but if they already support 4K then downsampling that to 1080p wouldn't be hard to do.
XV Pro Impressions from people who saw it.
http://www.siliconera.com/2016/09/16/early-impressions-final-fantasy-xv-playstation-4-pro/
Those who attended highly praised the high resolution, splendid texture, and smooth and stable framerate of Final Fantasy XV on PlayStation 4 Pro. Additionally, they said that the texture of the trees and plants on the field were really impressive, making it look like a completely different game from the original.
https://forum.finalfantasyxv.com/discussion/2587/tgs-trailer/p13
Gamergen impressions of XV Pro:
"What does FFXV PS4P bring to the table ? Well, in three words: it is MAGNIFICENT !
Between the demos we tested and gameplay videos we've seen so far, we can confirm, yes, this production will be much more flashy on the new hardware . Because the aliasing has almost disappeared and the clipping is better managed.
Optimization for a 4K picture, it brings several things. First, a sharpness in textures that literally explodes the retina. Everything is beautiful, everything is clean, it's breathtaking. Then the colors are dazzling and showy"
https://forum.finalfantasyxv.com/discussion/2587/tgs-trailer/p7
Gameblog saw the PS4P version behind closed door at the TGS , the guy on the video is talking like he saw the best thing ever .
For him the IQ is perfect and the draw distance is on another lvl , the PS4P pro version exploits the full potential of Luminous Engine .
He also says it is the best PS4P upgrade he has seen (maybe the only one truly worthwhile according to him ) .