Hidden Minion lvl up changes on PBE
On Live your ally minions have their levels based on the average lvl of your team and the enemies minions have their levels based on the average level of their team. This means that if your team carries and is higher level than the enemy team your team's minions will be stronger than the enemy's.
On PBE however minion lvl is based on the average of all players' levels. This means that ally and enemy minions have the same level.
This seems pretty big, don't know why nothing was said about it.