I wish the game turned out as awesome as that concept art. The only time I was wowed by Forerunner structures was when you first encounter the floating pillars on the second level. Now, if that sense of awe was spread throughout the campaign... Here's too hoping that with the new Xbox One hardware we will see some Forerunner architecture that blows our mind, as in the concept art you posted.
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http://www.blogcdn.com/www.joystiq.com/media/2012/09/h4campaignforerunnerthirdperson07.jpg http://www.blogcdn.com/www.joystiq.com/media/2012/09/h4campaignforerunnerthirdperson07.jpg http://www.vgblogger.com/wp-content/uploads/Games/Halo4/Halo4-Campaign-DawnInfinity/Halo4_Campaign_DawnAndInfinity_0001.jpg http://oyster.ignimgs.com/mediawiki/apis.ign.com/halo-4/thumb/a/a2/Ds_2_0178.jpg/468px-Ds_2_0178.jpg http://images4.wikia.nocookie.net/__cb20121207070560/halo/images/4/4f/Halo-4-Review-01.jpg http://images.wikia.com/halo/images/e/e5/Jm402.jpg