Somehow there is a hidden helmet on the disc... I have no idea how any of the modders and hackers haven't found it. Confirmed by bs Angel (Basically the new Frankie/Urk for 343i's) to be ON THE DISC. So that means it's encoded on to all the maps and will be usable everywhere. Makes you wonder how they've kept this hidden so long... And it also confirms that a hidden ending may still be in there somewhere. Looks like hackers in the gaming community aren't as good as they think!
I must say it looks freaking BA as well. Here's a pic of it along with the comparison to Marathons helmet - Link
Now in regards to how it's unlocked, 343i's is holding the keys to that one. Along with the Helmet, there is a rumored Chest piece but I haven't seen pictures of it just yet.
Here's bs Angel's comment about the armor... Read a little bit down and you can see it - Link
I whole heartedly believe this will be a Halofest related event at the end of August or so. Along with that, the details for the Title Update will be released then too. It's also rumored that the helmet will be included in the Title Update and will unlock it. 343i's has also said we'll have to work for it so a Community Challenge will be in order!
I don't know about you guys, but more content would be nice. Let's get another set of Forgetacular maps going! Along with that, we desperately need another Forge World. It's not anywhere near a huge issue, as I love the maps that have been added (Abridged is a personal favorite. The epitome of what Big Team Battle should be... lots of vehicles/power weapons. All out war!)