Agreed Overread, I would appreciate seeing new stuff for AoS too. Plus the Cult release could be really small and just include a repackage, a new character, and a book.
That is good reasoning Hollow, as we have recently got two new Aelf factions (Though DoK were a pretty marginal release....three kits and a book?). So maybe the Aelves are off in a he distance. To be fair, Destruction and Death are the alliances that could really use some cool new armies, off the top of my head they have only got one each since the game came about (I'm not counting writing a book for existing models).
A new plastic Herald is a possibility in the boxed set. I don't think we'll see the full Slaanesh release until mid next year though. I think that will include cultists of some sort, some "elite" option (Tzaangor, Blood Warrior, etc.) , probably one more dual kit, and the new KoS.
I imagine we'll seen Moon Clan, Darkoath, and then Slaanesh. To be fair, I'm just happy as long as we don't get anymore Stormcast or Nurgle from GW for a few years.