There are some leaked images floating around the internet today, including a look at the new Shield of Baal: Leviathan two book set, and the cover of this week's White Dwarf.
We know quite a bit about what is coming in the two book set from this report:
via an anonymous source on Faeit 212
Shield of Baal is the first release for the campaign. There will be more. It comes in two hardback books and in a slipcase.
book 1 comes with all the details on the invasion- background
includes the invasion of the Cryptus System, called the shieldworlds of Baal.
the astra militarum, blood angels and even the sisters of battle are mentioned here.
book 2 is rules including, Echoes of War scenarios (6), a cities of death expansion with 6 new missions, death from the skies rules for aerial combat.
Forces of Leviathan: a new detachment for Tyranids with warlord traits, datasheets for new units, and new formations.
Here are the two leaked images floating around this morning.
I am not sure where this originally came from.
Shield of Baal: leviathan
via Rogue Star on Warseer