Set 6: Vengeance is scheduled to be released on July 1, 2016! Panini says to expect spoiler images June 3, 2016.
The set is to include:
Heroes: Gohan Lv1, Krillin Lv2, Master Roshi Lv1, Trunks Lv1
Villains: Android 13, Broly, Cooler
Allies: Paragus, Android 13, Android 14, Android 15, Salza, Icarus, Cooler, Broly
Source: https://paniniamericadbz.wordpress.com/