I'm pretty sure there was some mention of the Hunter's orange body area being put to future use... I'm not sure if it had anything to do with a jump though. It must have been on one of the weekly updates. I'm going to see if I can find it.
The place with the gap and you have to use man canons to get to is shotgun spawn and its inside the giant rock formation separating the two bases and giving it the "U" shape. It replaced the tunnels. If you look at the map with all the weapon placements you'll see what I am talking about, I dont think its secret, and I haven't heard anything about hunter body parts being in match making.... >_>; It would be strange of Bungie to do something secret like this on a MM map.
hmm well i was looking at the blackout pictures and i think that maybe you might be able to get on top of the roof behind the sniper tower. maybe to unlock it you have to.. use the fusion coils to blow up somewhere on the map, and that lowers a small barrier preventing you from getting up there. or maybe there is just a control panel..?
I have found the part where it mentions the Hunter's orange body part in relation to the back of the scarab. I found this quote in the Bungie Weekly Update 01/11/08. It isn't much, as it is just a question a fan asked, but it does say that its use in a future DLC map is possible. Here's the quote: Azathoth117 asks: Are the orange worm-type thingies in the back of the Scarab the same things as the worms in Hunters, or is it just superficial resemblance? The resemblance is not just superficial. A future DLC map might expand upon that mystery. (quote taken from Bungie Weekly Update 01/11/08)