Aside from CD I would probably release a campaign/ supplement book the equivalent of a planetary assualt, with stuff on sieges, city fighting and campaigns all interlinked with a narative etc. It would primarily be done for the Empire but would include plenty of ideas for all armies. Basically update general’s compendium with a common narrative.
GW’s new business model: "We will dominate the market with a cohesive and balanced ruleset, well made and reasonably priced miniatures and an unparalelled devotion to supporting the hobby in all its forms."
That and revealing the location of the scuplt for the CD female warriors