I would rule out the Golem idea since it's just too similar to Wolds in Horde's Circle of Orboros, and GW would't want that for sure.
What I would like to see is the avatar of Dracothion or whatever the name of the great drake is, similar to the great feathered serpent (of course it will not be the same, but the basic idea still holds up). I would also like to see some toad riders for light cav, two skinks on giant fire breathing (star fire) toads of awesome. Some winged serpents/boas (two headed to mark the difference) would be nice with Saurus riders (saurus on bikes). Some oversized skinks would also be nice, with bows and perhaps using serpents (just like the bad guy in Conan the Barbarian) as arrows. Likewise, some pigmy saurus would also be awesome, hero hunters or monster hunters.
I just hope we can have an update soon. But one thing is for sure, when it happens it will be awesome. The models these guys are releasing just have me more excited with the possibilities we can have.