Nothing to be found on twitch this week it seems. I am very keen to see the rumor engine today.
Otherwise the only thing I think we'll see is the purchase lists from stores until Adepticon.
If they found a way to make them aesthetically pleasing and fit into the lore well then, yes, people would go insane for them.
The Demiurg do exist in the background and make a cameo in the BFG video game.
Guilliman already had his debut on Twitch. Plus they are capable of poking both systems simultaneously. What we still lack is a segue into Duardin...someone needs to leak the April WD.
This is the 40K part - it jives with the timeline for the new edition. AoS isn't getting new mechanics. Either way it is going to be a really exciting month!