I'll take a wild guess that Nuketown will be a pre-order bonus as usual. It was so bad in BO3 that I uninstalled it so I wouldn't have to play on it ever again.
Treyarch have some of the best maps in the series such as Summit, Firing Range, WMD, Jungle and Standoff but I wouldn't want them to recycle/remake/re-imagine any - I'd rather have a fresh batch this time around and no sniff of NuketoIVn either.
I have a horrible feeling this game will have a Battle Royale map too so COD can keep up the tiring trend and also win back some of the kids that went to Fortnite plus all their trusted cakesocking YouTuber's.