Agreed, I would not expect all of those classic maps to come back, but if at least one of those maps were to be remade and added to the map pool I would be happy. I however do not like remakes of those large maps (Hemerrage, and Valhalla) although I imagine fans of BTB would/do enjoy them. If I had to choose just a single map it would be guardian, but since I do see that guardian might not lend itself very well to sprint/armor abilities I think construct would fit into halo 4 nicely with minimal changes (Heck I want them both ).
Any DLC that would contain any of these maps I know would be very popular, I don't think you could find many halo fans that wouldn't want to play The Pit, or Lockout in halo 4. I don't think I could say the same for any of the remake in H4 so far, or even in Reach.