There's... just about everything in this announcement. It's a little hard to summarize, since it covers pretty much all of GW's game lines, from Age of Sigmar to 40k and their various spin-offs, as well as the Middle-earth Strategy Battle Game. Suffice to say that if you play any GW games, there's something probably in here for you to check out.
From the post:
The time has come for all the news and jaw-dropping reveals from the NOVA Open Warhammer Preview. Seriously – if you’re interested in ANY of this…
…then you’re about to have your socks knocked off.