So who else thinks this zombified ice dragon is gonna be Totenreich's boss? The drawings on Paradox Junction have a lot of references to past maps, so I'd be shocked if there aren't any teasers of future maps. An ice dragon for an icy map just makes perfect sense. Not to mention that the setting of Totenreich has a lot of similarities to Nastrond from Norse Mythology, a place that actually has a dragon in it.
I've seen some people speculate that the Origins robot might be the boss of this map, but I highly doubt that. We'll be fighting another Shadowsmith and I think one being transformed into a dragon makes a lot more sense than a robot. Treyarch also confirmed that the next 3 maps would have all new stuff, so a reused boss from Endgame obviously would not fit that.