Halo 5: Guardians concept art

I missed this the first time I read Frankie's comments on the Halo 5: Guardian announcement but on a re read I realised he slipped in a piece of concept art from the new game:

Note the giant dude that appears to be on duty behind the red flag, the flying squiggly things and indeed the red flags - not to many flags to be found on Forerunner structures....

Keen fans may recall the first piece of Halo 5 art to be released.