I like Kyurem's ice typing... there's only three other families in the game with an ice typing.
I thought that if there was another typing for the Tao dragons, it would be Dragon/Poison. Why? Each typing commonly coordinates to a common status condition. Burns usually occur due to contact with fire, paralysis is often caused through electric-type attacks, and freezing requires an ice-type move. That leaves poisoning and sleep major status ailments. Poisoning without a doubt would line up with poison types, and we have yet to get a poison-type legendary (probably because it is only super-effective against grass types, and grass types are pretty much weak to everything else). Can't do much with sleep- we don't have a sound type and the normal type is pretty useless.
However, I do suspect (which I hope my suspicions aren't correct) is that Kyurem's new form will be a Dragon/Water type. I say that as Genosect, a Pokemon that has yet to be introduced that is native to this generation, is compatible with four drives- three of which coordinate to the current Tao dragon types. It could make some sense, as ice melts into water... but I don't see that as very plasma-like. The poison type seems more like plasma. Plasma can be fatal when consumed, much like a poison.
