"This first forest area is all about stealth. At least, if you want it to be. Grunts, Jackals, and Brutes are patrolling the paths between the massive tropical trees, and with all the foliage and dark cover, it will be easy to sneak up behind them and assassinate them.
The alien trees provide plenty of opportunity. Their large roots are erected up from the ground, creating little tunnels to sneak through. As well, their branches can be jumped or boosted to, allowing for an exciting drop-assassination on the enemy below..."
This is a sketch from the latest Shield and Sword update that has been posted, imagining through art and text what the fifth level of an imaginary Halo 4 might be like. See and read a bunch more about it here:[link]
This post also includes artwork by other artists found at Halo.Bungie.Org and DeviantArt, like the awesome TDSpiral!