It seems like we have one of these threads pop up every few weeks or so... and I will give you the same answer.
While future DLC discussion is interesting... at this point in the game's lifecycle it is premature. We haven't played the game yet. We haven't played the 14 (15 counting Nuketown) maps, and watching them in videos is hardly the same thing.
In my mind, we should be encouraging DLC that fills a gap or a need. Perhaps we will find there aren't enough small maps... we can then discuss that future DLC should have more. Perhaps not enough snowy maps, or too many... we can discuss that.
Right now... talking about DLC is really not on point. Lets see what the game gives us first, and then we can discuss what we need or would like to see.
As for the old maps... been discussed 100000000 times on here. New stuff, not old stuff. The re-imagined maps are at least creative... but I personally would rather have all new maps to explore and enjoy.