I couldn't mind maybe one or two, but I think it's fair to say that the maps in MW2 didn't exactly work well... I mean, do we really want to suffer through the bad spawns, stupid camping spots, and unbalanced team spawns (Estate)? I could see them bringing back a map such as Favela, Rundown, or Karachi, because these worked pretty well, and were quite popular, but as some of you have mentioned, isn't it a waste of money to pay for old maps with just a simple graphics upscale?
I'm pretty sure they will bring a few back though, even if it isn't in DLC (I mean, look at Wasteland on MW2, that was inspired by a map from an older CoD game), because it's a good way of getting a bit more income - they only have to upscale the graphics, and maybe alter very few details for game dynamics, and it requires much less work than making a completely new map.