Based on the rumors, there are 10 formations, but only 6 datasheets. Not sure how that works, exactly. We've already seen 2 of them (khorne), and one was suggested to be a formation of 4 demon princes, probably one of each mark.Looks cool and just think: they have to be running out of Khorne stuff, plus (at least for 40k) there's a ton of new Daemon stuff for all the Chaos God's minions in the upcoming campaign book.
Seeing as there are currently only 12 daemonic psychic powers, that strikes me as unlikely. It sounds like we're getting 6+primaris per table, rather than just 3+primaris, in the 3 disciplines.There's 20+ psychic power cards being released for Daemons, those aren't for Khorne. Are they just reprints of what already exists...?