Tbh, I don't think Lifelands were ever planned as the next thing. I mean besides the name being below 3rd grader levels of awful, the concept of a plane of life seems rather idiotic.. what the hell is the mortal plane then supposed to be? I guess they could have tried to inflate the dream stuff some more, but it feels like a really bad thought out concept you get by hammering square pegs in round holes with a power hammer.
Frankly I would have bet more on light and shadow stuff, mostly light first since BfA is still too fresh, with a gradual shift towards a mixture over the expansion. We'd have at least some proepr hooks set up for that with the stormwind leadership, some hints towards Light-extremism, and one of the currently topical Nathrezim working for the Light.