Colorless Dragon?

Uum, the update itself told us, and weapons that are effective against dragons now display a colorless dragon icon too.

The bulletin board is our friend.

It was shown in the falchions description in the game and during the announcement of exalted heros with chroms falchion mentioning it

The trailer of Branded King shows a colorless dragon symbol.
The notifications.
The datamine.
Etc, etc, etc.

It's true