Ok so I pre ordered my Halo 4 and payed it off at gamestop but I was wondering what preorder bonuses do I get and should I up it to a limited addition can anyone tell me what limited addition even gives, I try to stay away from spoilers about the game so I have missed this information and would love if someone could tell me.
The pre-order bonus from gamestop is a Forrest Camo Skin:
the limited edition includes:
The Game (Obviously)
UNSC Briefing packet with armour customization schematic and UNSC Infinity details.
Free access to 3 future War Games Map packs with 3 maps each. (9 Free Maps)
90 Minute extended edition of the live action series Forward Onto Dawn. (DVD)
Early access to six specializations. (Ammo capacity upgrades, etc.)
Bonus Emblem, Spartan Skin, and Weapon Skin for Assault Rifle.
Xbox live Avatar prop and Spartan IV Armour set.
Hope this helps!
Heres a link to a thread that shows all the pre order bonuses
http://forums.halo.xbox.com/yaf_postst85439_All-pre-order-bonuses--with-info---06-10-12.aspx
Also for the record, its limited EDITION, not limited addition. 
No biggie, just helping ya out for next time.