As most of you may know, the Limited Edition content is not so limited anymore. Early access to the Specializations will be given to everyone who plays the game by November 20th. The FUD Extended Edition will be streamed over Halo Waypoint instead of being on the disk or being available for download (you will need a constant internet connection to watch it). The Map Pass that comes with the Limited Edition is cheaper, but the Standalone Map Pass will give you two Exclusive helmets. The other additional content, like the blueprints and papers, will be available for everyone to read online.
At this point, it's not really worth paying 100$ for the Limited Edition. You will save a lot of money by downgrading to the Standard Edition for 60$ and then buy Standalone Map Pass for 25$, which actually gives you the same, if not more, content. I will downgrade my pre-order and get the Standard Edition instead. What about you?
Source: https://forums.halow...ions-Early.aspx
Edit: It has now been confirmed that you do get the two exclusive helmets included in the Map Pass regardless of which version of the game you buy.