Since Landmark and Everquest Next share the same engine and certain mechanics, it’s possible to develop both games simultaneously at some level. In the latest producer’s letter, Daybreak announced that development on Landmark-specific content is taking a back seat to Next.
So, as we shift our focus and development to EQN, it just doesn’t make sense to continue with the Blueprint, since the goal of that has always been to provide short term, concrete plans of what you could expect and when, and that isn’t something we can reliably estimate at this point. When we have a better idea of timing on the various pieces, we will make sure to let everyone know.
(Source: Landmark)

