@nprofile1q... I dunno man, seems mediocre. I last played P4G with the Community Enhancement Pack.
More/Better cutscenes with animation would be neat, rather than most scenes being rotating models with some 💦, ❗ and 💢 popping up next to their heads. And it seems like there'll be more free camera control to get a better view of inaba, although it doesn't help a lot unless they add much detail outside of what was already seen in P4/P4G. And P4G was designed for a Vita screen, so when playing it on a TV it can be pretty awkward, the text box consumes like 1/3rd of the screen and the character portrait cuts out a vertical slice as well. Not to mention that everything is just oversized in general.
I was a bit hyped when the teaser dropped, but after seeing the actual trailer, not so much. It seems like it's just a "newer" version with better graphics and which works better on a large 1080p+ display. Not necessarily a "better" version.
As for the voice acting, I have no clue. I've only ever played P4/P4G "undubbed" with Japanese voices.