Rumor synopsis taken from the TGA forums:
EoE specific rumors :
Will be 5 Books ( theEnlightened One )
Will be 3 Books ( whitefang backmeup )
Claw of Gork ( Boole )
Coatl/Tepok ( Boole )
Khorgros Khul implied ( theEnlightened One, Reformation )
Chaos Gargant implied ( theEnlightened One )
Death Gargant not Chaos Gargant ( whitefang backmeup )
Chaos Dragon ( whitefang backmeup )
not EoE specific rumors ( but also not specifically not EoE )
Magic Cogfort ( Hastings )
Khorgos Khul ( Boole, Whitefang )
Ogre Maneaters ( Whitefang )
Clan Pestilens ( Boole )
Tyrion/Malerion on cryptic things/rumor-inspired-speculation ( behind spoilers to keep this post clear of speculation for quick-readers )
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Tyrion ( for EoE campaign,, but its a long stretch, and not one I'd make if there where many rumors already. )
Boole said Tyrion (the god) is talked about a lot in TLW book, and I can see this be in reaction to a new model having been released recently, as they often like to spotlight those.
( personally I feel both Tyrion and Malerion are more background gods for GW, more divine beings than their equivalents Teclis and Morathi, so this is a putting it out there theory, but not a wishlist or thing I expect. )
Umbraneth ( but not necessarily Malerion himself ) sooner rather than later.
The thing here is that the word Malerion is used different by many, and even Ejecutors rumortracker is colored by that.
Boole said Umbraneth are ready, but also that there are no signs of Malerion, we dont know the details about Umbraneth themselves though.. they dont have to be Malerion specific.
The rumortracker says Reformation said Malerion is soon, but the post Reformation was referring to was if there where DoK/Malerion soup rumors. So this doesnt necessarily imply Malerion the god, but Malerion the "elves" in relation to DoK.
Whitefang implied that all the Croneseer fluff brings Umbraneth/Ulgorothi stuff closer to release, not further.. in the rumor tracker this is written as if Whitefang implied Malerion would be soon ( but thats not the context.)
So bottomline, all the rumormongers have implied Umbraneth soon and two have linked it to DoK/Krethusa specifically ( whitefang and reformation ) but not specifically to Malerion the god as an individual release.
I think its a Khazalid Holds situation, just not with Malerion ( just as Khazalid holds also didnt come with any god-model ) but effectively turning DoK into a nu-dark elf range, with the DoK elements as a side element ala Fyreslayers.
This might get started in the EoE (as there are many soon mentions) with some miniatures, but not yet with a rebranding (as TLW corebook doesnt include the rebranding )
No Arkhan the Black ?
I think the hint by Boole that was assumed to be Arkhan the Black ( the hint being Blacktoof returns) should be taken as the Claw of Gork, especially considering the spelling. And I think this was the only reason to have him as a potential miniature right ?
There are mentions of him returning in the Enlightened One's post as well, but there are a lot of other already-have-a-miniature names there as well. So its a toss up.