I'm sure it has nothing to do with the game, the look is horrible, and why color ?

Armor, Item, Weapon, Loot, etc.
Why show that in the UI ? you can simply open your bag and see what there is on it.
Why not simply add a "140/200" somewhere to show the free inventory space.


I really think it could be a dev's tools (monitoring?). As Yoshida said, it's a real time screenshot.


what if we fighting multiple mobS?
One of the enmity meters on wow (called Omen), show only enmity bar from everyone on your current target only ! if you switch target the enmity bar change to the target you switched.