wishlist for P4:
- better dungeonS (after seeing the trailer looks like this is the case..... there are DOORS which is a vast improvement over tartarus

also there's a "B8F" near the end of the trailer....). What would be good would be some 30-40 floors dungeons, a new one every month or two. Some puzzles would be fine, too, even if it's randomized shouldn't be too hard to put a pre-designed room or two somewhere along the line.
- better S-link management. I know this is not a date simulator, but i really liked the social aspect of the game. What i disliked in P3 about s-links was the fact that it was basically a "gotta catch'em all" with real people. Except for pissing off characters (esp. women) there was basically not much to see (sure, the sunday dates, the presents, etc), but what i would like to see is some sort of branching paths depending on which relationship you improved. Like, if you get a gf stop the "i max her then move on" bs (i'm a faithful person :lol), or making friends with someone voiding the possibility to get another, different friend, etc.
So that even dialogues OUTSIDE of the s-link would matter depending on the choices you've made, so that main storyline dialogues would change (i mean, if i woo-ed yukari all the time, shouldn't be too hard to put a final cutscene between the two characters.... or even slight alterations during normal dialogues). The fact that there are multiple ending could be a starting point anyway..... i know this would be a completist nightmare, so i'm not holding my breath.
- less enemy color-swapping. In p3 there were many personas with unique designs but the dungeon enemies were under the 20-some count, i think. Even the bosses were recolored version of normal enemies. Let's hope atlus doesn't go cheap this time.
- something to do at night (i know this is partially addressed in FES, but....), like the possibility of visiting all of the town at nighttime, maybe with others characters as well..... you know, i would have liked to go karaoke with others instead of that solo-ing all the time. Or seeing a movie with others, etc.