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Essentially, as we understand it, every realm except Azyr (Heavens) was already invaded by Chaos and was losing badly at the point Sigmar threw his toys out of the pram and retreated back to Not-Asgard.
We don't know how said wars went in detail, but it's a fair assumption that Shyish (death) is still fighting because that's where Nagash is based, and it's unlikely GW wouldn't keep him around - plus, he has essentially unlimited forces within his own domain.
Ashqy (fire) lost, and lost hard. Aside from the odd tribe of runaway refugees, the entire population has fallen to Khorne or been killed, and the world has been reduced to a burned, war-ravaged mess with nothing but occasional ruins.
We know the forces of Destruction (primarily greenskins) are out there somewhere as they're one of the four named factions. Given descriptions, I would assume Gorkamorka and the orks will be somewhere in Ghur (Beasts). Remember Grimgor ended as the Incarnate of Beasts, and the 'world of savagery where only the strongest survive' is a sensible place to put the core of the orc faction.
Since the campaign books are supposedly coming realm-by-realm, expect the various chaos powers to come through in the realms they've taken over - Since Death is occupied, Nurgle best suits Ghyran (life) - the garden of nurgle could overwrite such a realm happily. Similarly, as the trickster and sorceror, Ulgu (shadows) strikes me as a natural bastion for Tzeench, but Chamon (metal) is also possible.
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