This is the new Rumour Engine Teaser...your guesses? Definitely looks AoS to me... perhaps Grots?
via the Warhammer Community
https://www.warhammer-community.com/2018/06/26/the-rumour-engine-26th-june-2018/
The Rumour Engine – 26th June, 2018
You guys like sneak peeks, right? Here’s a look at an upcoming release…