A large chunk of PR text direct from Microsoft and 343 for you now. Here's details of Halo 4's Limited Edition (which will retail for £69.99):
"Halo 4: Forward Unto Dawn Special Edition - An extended 90-minute version of the live-action digital series that will bring the Halo universe to life as you've never seen it, providing an enthralling backstory leading up to the events of Halo 4.
Halo 4 Limited Edition also includes the following bonus videos:
Bonus in-fiction content expanding the characters and stories of Halo 4: Forward Unto Dawn
Special Featurette : Bringing Gaming into Reality
Making of Halo 4: Forward Unto Dawn
War Games Map Pack Access - The Limited Edition includes access to nine maps - three future competitive multiplayer map packs, each including three locations, otherwise available for download post-launch on Xbox LIVE.
Specialisations - Receive early access to six Specialisations, to achieve higher ranks in your Spartan career.
UNSC Infinity Briefing Packet - Includes an armour customisation schematic, a blueprint of the massive ship itself, and insight into what it means to be one of humanity's finest warriors: the Spartan-IVs.
NEW Exclusive digital content through Xbox LIVE:
Spartan-IV Recruit In-Game Armour
Spartan-IV Prime In-Game Armour Skin
Assault Rifle Prime In-Game Weapon Skin
Prime In-Game Emblem
Xbox LIVE Avatar Recruit Armour
Cryo-Tube Xbox LIVE Avatar Prop
There's also details regarding the new War Games Map Pass. Available as a part of the Limited Edition, or as a standalone option (for 2000 MS Points), the Halo season pass includes "nine competitive multiplayer maps - three future War Games map packs, each including three maps - giving you a variety of new exotic battlegrounds post-launch." Buying the pass will give you 15% discount over getting the content individually. It will also include: "the Spartan-IV Scanner and Strider helmets, and the Falcon in-game emblem."
The game is set to launch on Xbox 360 on November 6, a date that can't come quickly enough for our money.