This is to clear up some things in the storyline:
Panther (new ATV, no pics but it is different the the Mongoose Halo 2 rendering)
Hornet (the new Human flying vehicle it is smaller than the Pelican and Longsword)
Revenant (new human tank, it is different then the scorpian, not much details though
)Purge (this is a covenant heavy vehicular transport, like the Harbringer from halo 1 this thing transports the big things like Phantoms and Serpahs
Seraph (a covenant heavy-bomber)
Here is the E-mail it is very long though! Prologue
Upon returning from deep space, after destroying the weapon known as Halo during a conflict with the Convenant, you, the Master Chief and your trusty AI guidance system Cortana, find yourself in front row seats to the end of Earth. Covenant Armada Battleships attack at the Earth mercilessly in hopes of destroying your very world. Seeing the imminent danger, you jump into action. Literally.
Level 01
Nothing More Than Memories
Spotting the attack on Earth you drop from your ship in space, propelling yourself downward towards a gigantic Covenant Armada Battleship. You grasp onto the edges of the ship and find your way into a ventilation shaft and then a shadowy corridor.
Once inside the craft you make your way through the all-too-familiar corridors and meet up with Covenant Troops (Elites, Hunters, Grunts, Jackals, Brutes). You battle deep into the belly of the craft, via Cortana who advises that Marine prisoners are aboard. Once you find your way to the prison block the Marines tell you that several of their vehicles have been confiscated and are in a rear cargo hold. You and the Marines make your way there, taking out Covenant Troops on the way. You locate the vehicles, several Warthogs and Panthers, the new ATVs, in a cargo cell on the nearest side of a huge docking bay, which is holding their ship, the Purge. There you charge out of the cargo cell and battle several large bands of Covenant Troops throughout. The Marines have told you that there is important information on the ship, but you are unable to get to it in time. During the battle the Covenant see your plans to steal back the Purge and they release it out of the bay, pushing it down toward their target on Earth, New Mombasa, a major protectorate located in East Africa. When you're finished mopping up the Covenant Troops, Cortana tells you and any remaining Marines to head to a front docking bay where a Covenant Battalion is waiting to board a drop ship headed toward Earth.
Once you arrive there you see you are largely outnumbered and Cortana suggests sneaking aboard the ship, and making themselves known only after landing.
Level 02
Another Day In The Office
Once the craft touches down atop a gigantic skyscraper, in the city of Versani also called Earth City (the largest city in the world located in Eastern Africa), Cortana advises that several kilometers away is a Marine Pelican with familiar faces. In order to reach it you need to scuttle down the skyscraper through the internal structure of the building.
The drop ship releases you, the Marines and the Covenant Troops and immediately you
