The glyph code was first tweeted out by ONISEC3 before it was picked up by the "Halo" Reddit regular Cyren. The code can be seen above and redeemed at Halo Waypoint. After entering the code and clicking the ">>>" button, you'll be granted 25,000 experience points (aka Spartan Points) and a number of concept art images from the three Majestic Map Pack maps - Landfall, Skyline and Monolith.
This latest glyph code grants half of the experience points of the LASO code but it is no where near as difficult to complete.
The Majestic Map Pack was also released today starring the three aforementioned maps, a new gametype and two new multiplayer playlists. You can catch the full details on the maps here.