To me it looks like a new Saurus Warriors kit, given how everyone except me has been complaining about the current set, and the model shown has quite a small shield and few elements of Aztec jewellery or trappings, representing a low rank, and especially given that we already have three options for a plastic foot Oldblood - the one that can be built from the Carnosaur kit if a Troglodon is built, the great one from the Warhammer Fantasy days that's one of the few plastic character kits that's still decent value for money, and the one in the Underworlds Warband. However the foot Saurus could also be a Sunblood, though it carries a Macquahuitl and not Gor-Rok's Made of Ulamak.
I'm particularly interested in this other Lizardmen release:
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It's definitely Lizardmen because of the pendant hanging from its tail and the ring around one leg. At first I thought it was a new Cold One sculpt, but then I noticed the feathery wattles or arm feathers on the bottom left - this to me looks like either a new dinosaur in the style of a Therizinosaur, or GW are revamping the Cold One aesthetic to be more like Therizinosaurs, which admittedly would look great and would be a nice move away from the generic-looking Dark Elf Velociraptors.
As for the other shadow teases, the first one is indecipherable, the one after the dinosaur looks like either yet another berserker with axe for Blades of Khorne or a melee-focussed infantry Ossiarch character (Ossiarch axes have curved hafts if Kainan is anything to go by), and the last one has to be a Slaanesh mortal with its graceful appearance and piercing through the hairpiece.
Poor old Kharadron were shoved to the back of the release queue this time round, though I hope they get something decent accompanying the book to make up for it.