Any of these changes i would love ;D :
Commentary. Probably the least important of the changes but for once in the series would it be too much of a ask if they could get a better bunch of script writers or translators. The current commentators are alright I suppose, they just say really obvious stuff.
Better quality of in game menus. Currently have disgusting menus in place with pixilated graphics (no matter the resolution). Starter screen is quite good actually but that’s not the one I want changing (Editing !!!). FIFA has a great menu systems but not a lot else
Improve single player - Highest priority! I know people play PES for Player vs. Player (so do i) but surely there's room to improve the Single player aspect in more ways than one.
Better CPU AI. I feel the current game has the defending aspect spot on. It's pretty hard to break the CPU down and it doesn't give much away (5 stars). That's not the case going forward. Rarely do they 'rip me open' with a defense splitting pass or some great build up play. Right now there aren't enough counter attacks as well. I feel the computer doesn't commit their players enough. Only sometimes do you get a centre back coming out of defense with the ball. More risk taking would introduce more open play, although this might effect the 'hard to break down' aspect I've already touched upon.
Also, in normal play with possession of the ball there's like a mini force field once you reach the outside of the box. I want my player to dash through the centre occasionally (with the ball) similar to what Gerrard or kaka might do once in a while. It must be one of the hardest things to code but a improvement in this overall area would be welcomed by a lot of people.
At the end of the day you don't want some gung hoe CPU AI but its about the balance. Right now I think the balance is just slightly pushing towards the defensive side.
Better ML. Dull and boring once you acquire the best players. Needs some new options or something to make it more interesting. Imagine just a quarter of what FM has to offer and put into PES. It would be class! I also wish there was an option for the Red morale option. I hate playing with low morale during master league games. Slightly more realistic but it slows the game down so much.
Licensing. This effects the console users the most. PC users to a lesser extent (due to obvious reasons). Its terrible how they cannot afford to attain some decent licenses to cope with the kits etc. I cant imagine Konami spend all their expenditure on the software development process. May be its put into other areas like advertising. Although there's not much advertising over here but they may spend a lot other in Asia.
Better Crowd chants. A long shot this one. I can't understand what they are saying and I think that has been done on purpose cause they do not have any real life chants from any stadiums.
Weather. May be a simulation mode you can turn on which effects the physics on the ball and the length of which your players could slide. It would make great fun pulling out a few last ditch tackles
ANiMATiONS 1. They improved 6 a great deal. Very subtle changes (goalkeeper takes out your player leading him to fly in the air) but they improve the game on many levels in my opinion. They make the game flow better, look better, feel better etc.
ANiMATiONS 2. Currently when you want to clone a star player through edit mode, you do not get their animations (when you press a certain direct on the keypad the player will mimic a similar cruyff turn - Gerrard can do it) and skills (flip flap - R2 x3.) Small and subtle change but it will make creating your own teams (of your mates) that much better .
Effective tricks. Without getting into the territory of that FiFA street game, I feel a couple, at most, would add to the game. Right now there's only 2-3 at most that are actually useful in game (pull back, feints - double, single, flip-flap, cruyff turn then spin)
Different tackle. I say this every year on PES forums but I'm starting to think it might never get introduced. I want a more aggressive tackle that takes both the ball and man. I don’t like tackling someone and leaving the ball about a foot away from the tackler. One of their players can pick up the pieces and run straight past the tackler who's still getting up. Its similar to diving that its in the real life game but I can never see it being introduced. Diving should never be put in. It was on FiFA 97 or 98 I think and it was terrible. Good laugh though just falling to the ground about 10 yards away from any player.
More editable features. The more customizable options available then the more likely you'll get the desired look for a player.
Better Keepers. Keepers rarely pull off any out of the ordinary saves. All the saves you see are ones you think 'good save but I'd have expected him too to save that anyway'. I reckon after their stats reach about the 85 mark nothing changes in terms of actual shot stopping.
Indirect Freekick. How many times do you score from a set piece? Putting the ball in the area hardly results in anything. Plus the players never make the runs as they all stand outside the area for some reason. If they increased the swerve and better positioning im sure there would be a great scrap in the box.
People always have long lists like these but if just one would make it into the game then I'd be chuffed.
edit- Graphics, removing open goal erratic shots and ability to chose a corner of the goal to score in once through on goal