1. Longer than the previous games. 2 and 3 were too short, 1 had the right amount of length.
2. More post game stuff. 1 and 2 sorta had this, 1 mostly with the heroic challenges, but there needs to be more aside from arena stuff.
3. Jump attacks. Jumping is a good start, but attacking in the air needs to come next, the 3DS versions already do this.
4. Skippable cutscenes. It ticks me off that I have to wait 5-10 minutes to get in-game and playing when the game replays a cutscene that you already saw when trying to be in the hub, the same cutscene that played on startup into the hub plays EACH time you go to the hub, and on following times, you can skip them, but only after the game finishes loading.
5. PS3 version needs serious work, the game is so blurry, but it looks great when you go to an upgrade station, the character shows up on screen in HD glory, but when you leave, it feels like looking at a smudged TV screen.
6. Bug fixes. Glitches. All of it needs to be gone. I have had many a gamebreaking bug/glitch over these games, only on the console versions mind you, the 3DS versions are well done. In Spyro's adventure, a quest item wouldn't spawn, in Giants a movable block refused to move that needed to be moved to continue the level, and in Swap Force, entering a certain arena on a certain level made the screen turn green and glitch out, requiring a reset.