New Daemons rules are being posted up by a guy on a German forum who has access to them early via his IPad or whatnot.
http://www.gw-fanworld.net/showthread.php/182161-D%C3%A4monen-2013/page47 has the original
Tzeentch Chariot thing has two fire modes - Stbd AP3 Torrent, and 18" S9AP2 Assault 3
Screamers are basically identical, except they lose Eternal Warrior
Flamers got mega-nerfed ... largely the same, possibly 3 points cheaper if I'm reading correctly, but their weapons became S4AP4 flamers
Eternal Warrior is largely gone
This will make Daemons players upset in weird ways (WHAT, THEY ARE DAEMONS!?!) but actually makes a ton of sense fluff-wise. Daemons are eternal in the warp ... on the material plane they are bound to existence by the physical form they are occupying or holding onto through sheer power ... devastating damage to their corporal hosts makes it very difficult for them to remain on the material plane. Hence, destruction from things like Instant Death would actually be MORE devastating to Daemons, b/c as soon as it hits them they're going to largely vanish back into the ether, leaving nothing or a completely different looking corpse-host behind.
Skulltaker, btw, seems to still be eternal. All the other dudes, including Greater Daemons, are not. This makes them a bit Enfeeble / rad grenade bait under certain situations, but isn't a HUGE dealbreaker otherwise. If Kairos is T5 still, this is worst for him ... b/c he can suddenly be a grounding test away from game over if he takes an Enfeeble or similar effect.
Faeit212 has the warpstorm table
You roll this in the shooting phase, apparently. The snake eyes isn't as bad as people feared. Still kinda sucks. On the flipside, boxcars means you get a potentially very expensive scoring unit of choice added to your army. Kinda cray cray.
Instability seems to be fearless to shooting based morale checks, but not in CC. In CC, you take extra wounds for each # you fail your LD test by. That said, boxcars poofs the entire unit, and snake eyes regenerates all the damage you suffered in that combat (so, yes, you could whittle a screamer unit down to a single wounded model w/ a nice charge, and if they snake eyes their Instability test, see them all come back to life as if the combat never happened to them).
Kairos apparently has only a 4++, and I heard somewhere that his re-roll only applies to invul saves now. His powers also seem a little whack / difficult to use properly / oriented around his two heads. It would be GW-ish to see him get nerfed, since so many Daemons players use him. Additionally, looks like plaguebearers got the worst of it with the nerf bat ... getting cheaper, but also dropping to T4 and losing FNP (though there are ways to give it back apparently).
Daemon Princes are indeed HQ, but taking a standard or named Greater Daemon of their mark lets you take them as Heavy Support anyway. They seem to have largely gotten more expensive, especially if you want wings.
Lots can be mined from there if you have the time to sift through the wall o' chrome-translated text. Page 41 of the thread. Phoron is the poster.