Whose descendents ARE Lizardmen?
And to Fangs First:
Honestly, the factions of Chaos are more likely to volunterily work together than something like Dark Elves and Orcs teaming up... If I've got any handle on WHFB fluff. And also HOW DARE you suggest that the MMO Chaos has no character! The entire plot of the Chaos back story is that it is Tzeentch that the army is being led by. There are aspects of the others throughout the plot a bit, but its mostly the big Tz running things... then again I don't really read the quests that thoroughly...
Perhaps its also a bit 'chaos undivided' since I've noticed Chaos Magus are able to summon Nurglely things... ?
Generally I would disagree. Chaos only unites against something big, other than that they tend to hate each other as much as any other foe.
Now that you say that about Chaos in the MMO it does make sense. The disks are a dead giveaway, but I guess the tank and healer are both generic chaos enough. The melee DPS does change his form which is very, very tzeench, but Chaos in old world Warhammer seems to get more random, chaotic changes (see the chaos beastmen) regardless of actual god. Of course the beastmen could be fully Tzeench and I just don't know, I'm only like 50-75% on WH fluff.
I think you could argue that it's still just Tzeench, as I could see a sorcerer binding another god's demons for their benefits.
As far as lizardmen, from wikipedia:
"The history of the Lizardmen began before the Old Ones arrived in the Warhammer world; some of the Slann traveled among the stars with their godlike masters. When the Old Ones arrived on the warhammer world, they settled in Lustria where they used the amphibious creatures already living there as slaves that would serve the Slann. Out of this the first spawnings of Saurus, Kroxigors, and Skinks were formed. During this time, the Slann spawned on the earth as the world was being shaped to how the Old Ones wished it. Armies of Saurus destroyed unwanted races as the Old Ones created the races of High Elves (powerful magicians), Dwarfs (magic resistant), and Men. Later, in the coming of Chaos, the Old Ones either went missing, or sacrificed themselves to try and destroy the polar gates and halt the never ending tide of Chaos in a cataclysmic explosion. Every race formed by the Old Ones fought against the threat of Chaos, including the great armies of the Lizardmen which consisted of millions of Saurus."
So, definitely they would be order according to this. Lucas, I think this is a different type of Old Ones, not the Great Old Ones, if that was where you were going. Also Lucas, who says they won't make single race decks? They've already said that you can do it, so why not do what they're doing with House Martell and Greyjoy: It's a smaller-than-core but bigger-than-chapter-pack release that has a playable [insert new race here] deck.
Or heck, they wouldn't have to even do that much, they could just start slipping them in to Chapter Packs and you might be able to quickly coalesce a new army. We don't even know how easy this is, as we have no idea (well most of us don't) what type of structures or other things there will be in the deck. I would speculate, but going by the previous Lang games, we have one with cards that are strictly resources and one where all cards can be used as resources, so I'll wait to get an intro to the game (which I'm doing with baited breath).
Heck, this made me start to play the MMO again! You know, mostly because I've just done everything that interests me in WoW, but still!