The explanation of what Exposed is was unintentionally left out of the weekly blog today. It has been added, and here it is for your convenience:
New Mechanic: Exposed
Exposed is a new status effect that can be inflicted upon enemy characters.
Exposed can only be cleared by abilities that specifically mention Exposed. Two characters are currently planned to have abilities with Exposed, with Super Skrull being one of them and a second to be announced in the near future.
It’s a neutral effect, treated as neither positive nor negative, like Charged. Exposed has no inherent effects, but characters like Super Skrull have abilities that will react with characters inflicted with it.