The New DLC helmets for Halo 5 that are coming in 2017 have been found in the game files by the modding community and they look pretty damn good
Here's a video below showing the helmets in action.
Check out @Shinozaki_Bivi's Tweet: https://twitter.com/Shinozaki_Bivi/status/807333493382332416?s=09
heres the other helmet
http://imgur.com/iRheWlx
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That whale helmet isnt real right?