Chapter/Generals were released one week before Dominion/Indomitus preorder.
The main problem with new editions is that the released are always 3-4 weeks including the two preorder weeks, so the timeline is half July and half August for all the contento after Leviathan party starts.
Leviathan preorder starts June 10, a lot of influencers have the box right now and they are preparing the material for the release.