They just say it was supposed to be in the original anniversary map pack and thats it
I heard that too. Not quite sure what they're talking about though. I mean, it reminds me of a couple of Halo 2 maps. None from Halo: CE come to mind.
Probably a remake of Headlong that got scraped
but there was a headlong remake with Anniversary. why would they be working on 2 remakes of the same map at the same time. I think it was Terminal or Turf. those are both very popular within the community