Arena - water? Ya

I'm checking sometimes official Korean Diablo Twitter, and something what i saw today is strange:

"[디아블로 III 배우기]디아블로 III의 플레이어 간 전투는 성역 곳곳에 흩어진 투기장에서 이루어집니다 각 투기장은 무작위로 생겨나지 않고 고유성을 지니며 지형과 엄호물이 다른 비율로 설계되어 있습니다"

What means (not exactly, but i don't know korean)

"[Diablo III Learning] Diablo III, the battle between the players scattered throughout the sanctuary will be at the Arena at random creatures of every arena but the uniqueness of the terrain and jinimyeo[lol, what is dat] is designed to cover the water at different rates"

Wut. Bashiok, can you explain us something about it ? :)