I am sure every available employee has been busy polishing and fixing Three Kingdoms, at least since the release of the Pirates of the Caribbean pack. The positive reception of the next tent-pole title is infinitely more important for Creative Assembly than a minor DLC for an old and averagely profitable game. Moreover, the golden rule of the marketing is not to distract your customers with irrelevant news during, when a release is imminent. After Christmas, CA had prepared a wave of promotional material for Three Kingdoms, specifically designed to build excitement and multiply pre-orders for the upcoming title. Simultaneously selling a lord pack would damage the sales for both the DLC and Three Kingdoms. To be honest, there was never any possibility that any new DLC would have been published between November 2018 and March 2019. After all, CA needs to proportionally distribute the limited number of planned Warhammer DLCs, in order to maintain interest for the announcement of the last part of the trilogy and to prevent any social media outrage at the apparent lack of care. Earliest possible date is probably around May, but I am certain that the lord pack will be uploaded before the summer holidays, with its campaign successor getting released sometime close to the first annual anniversary of the Caribbean Pirates.