This is essentially just stolen from the conversations we were having in the theory crafting thread.
This is just a blind shot in the dark.
With the usual "tags"
+ Subfaction craving Releases (DA/SW/BA, World Eaters, Emperors Children, Sororitas, Inquisition, AdMech to a degree, Tau, until recently Orks, etc.)
+ "New" Big Modell from the Wishlist (Primarchs for either side, Silent King, Primork Ghazkull, etc.)
Optional Addendums for rules:
Re-done Codex or Part of new Campaign Book
And I get it.
A Shooty/half-melee focused Boxset with Primaris DA against whatever (Emperor's Children?), with corresponding Campaign and Lion'el Johnson vs Fulgrim COULD be the next step.
But the same goes for a more Melee oriented Box containing Primaris SW with Russ against World Eaters/ Berserkers with Angron + Campaign or redone SW-Codex and Khorne-Codex.
Or Black Templars or Salmanders vs. Primorks.
Or Raven Guard Primaris vs. New Sphere/Wormhole-Tau. Corax returns to end the false Tyranny of the Tau or so...
All of those could be turned into something that makes sense Storywise.
All of them would sell.
All of them could be turned into Rumors.
This is a futile Endeavour. And with THIS rumour coming from BolS? Yea... not gonna buy that.