I don't know if many people have been keeping track of PAX, but 343 announced that they are going to add a' new '(and free) forge map!

Unlike the previous three (which according to some people were inadequate)  This new map has only three small to medium empty islands in it, leaving the rest of the rather large map completely empty with plenty of room for forging.

If you want to hear more about it check out IGN or Halo4Follower on youtube