Yesterday on The Legend of Zelda's official Japanese Twitter account there was a new post showcasing an all new piece of concept art featuring the Zora tribe. The tweet also talks about a bit of the lore for the Zora tribe as well. We also see here in concept art the Zora tribe apparently wearing helmets that you would wear when going into raids. This is pretty mysterious as why would the Zoras where battle masks for, and were they in some sort of war, or was this maybe concept of Zoras fighting against Zant this is really mysterious, and we don't know the answer.
“…It’s Malo. This is the battle mask worn by the Zora tribe… but there are more variations than I thought. Were they in bad terms against the Goron tribe in the past…? Many of them were used specifically for raids, but on the contrary I think they look more conspicuous…” — Malo