Ok so here's my prediction. Since this game obviously has something to do with the planet Reach, if anybody has read the books, then they would know that a few Spartans, excluding the master chief, and a woman ( like the one up top), Dr. Halsey, hid out in old mining tunnels under the surface of Reach. Now to me, this looks like that group, give or take a Spartan or two.
There is the second figure, Dr. Halsey. The far right figure could be Linda, the amazing sniper, but she is with the Master Chief on a space mission above Reach. As for the other figures which, keep in mind, could very well be Spartans in Mark V armor. They had to drop from a Pelican at extreme altitudes, and used the shields to survive the fall.
Then again, all this speculation is based on the prediction of Spartans being in the game. If that is not the case then haha all of this writing was for nothing...