I think after Wrath of the Everchosen, Archaons plans for freeing Slaanesh may be on hold. I'd also rather see the other Alliances fleshed out, almost like whilst WoE was happening, Siege of Excelsis or whatever they do next was happening simultaneously or shortly after. Death and Chaos have had a lot of attention in AOS and I think it's time to spread the drama out.