Halo 5 Guardians Beta map possibly made?

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*Original post. Click at your own discretion.

So I was talking to a buddy of mine and he stated that somewhere there was a version of the Halo 5 Guardians Beta map shown in the beta trailer, made already on Halo 4. I have looked and looked and found nothing good as far as design goes but he was serious about it being made and looking amazing.

I have yet to find a map of such but he also mentioned it was on the front page of site here, possibly 343i spotlighting the person who made it perhaps? If anyone knows of this map I would like to take a look at it for as myself I, too, am making a map based on the Halo 5 Guardians Beta map shown in the trailer.

Note: He said he saw it made on Impact but again I search Impact and found nothing decent.