I really hope that in the next update, we get a Physical/Special split, as well as some update of the move set of some fighters, such as Yamcha learning Kamehameha on his own.
The typings should either be updated or be revamped so that some characters, such as Majin Vegeta and Frieza aren't weak.
I also hope that the TMs become reusable. This is a feature that is present in several ROM Hacks, such as Radical Red. This is one of the reasons why I usually play Fire Red or Emerald with the ROM hack for reusable TMs.
Also, if possible, I would really like if they utilized some of the mechanics from Radical Red as well, such as no need for HMs to be in the move set for them to be used. Simply, if I have a Fighter that can use Cut, but I haven't taught it, the Fighter can still use Cut on bushes. It would save up on the four slots, choosing optimal moves.
There are several characters I would love to see get included here as well, preferably as a post game addition, such as SSJ4 Gohan, who is from Dragon Ball Heroes, as well as Golden Metal Cooler, also from the Super Dragon Ball Heroes franchise. I would wish that Cumber got Super Saiyan 3 instead of the Great Ape form.