Good afternoon everybody!
So upon breaking theater in Halo: Reach on the Xbox One (Oddly very easy to do by accident on the Xbox One), I was able to look around outside the Battle Canyon DLC Map, and I found something very interesting. There was a rock shaped formation that oddly looked like the head of a Halo 4 Grunt. Here is the photo (Click Meh!). Did 343 Industries hide a tidbit of their future art in this map as a rock formation, hoping that people would be able to reflect back to it when Halo 4 came out? Curious to hear people’s thoughts on this, and the potential that this can be an Easter Egg.
I don’t know…it doesn’t look like a head to me. Sure, the shape is spot-on, but I don’t see any more details beyond that, so it could just be a coincidence.
It just looked like a rocky rectangle to me. I saw two black spots that could look like eyes but thats it.
Can’t be it.
Halo Reach was made by Bungie.
Halo 4 was made by 343i.
Means they weren’t working on any “concepts” as you say.
Probably just a rock cast aside 
Must’ve been a misplaced rock 
But have you found these across the maps, they are pretty hidden so Forge & YouTube are your best friend
Battle Canyon pic
Timberland pic
Headlong Pic
I forgot the name of the map
hang em High pic
Solitary Pic (Bit hard to see but you can see a map in there)