The leak threads are getting ridiculous, so how about we try a different approach? Simply design a quick excerpt of the expansion you want to have post-BFA. From realistic to Tuskarrs of the Black Empire, nothing's off the table!
Being a fan of the rumors of a Death expansion, I'm thinking World of Warcraft: Shadows Gather!
new continent = shadowlands
new features =
*titanforging replaced by voidforging, where ilevel/socket upgrade items can be obtained, and are more frequently obtained from more challenging content.
*Racial divides deepen as race questlines develop in a similar vein to order hall campaigns
*culminating in mage tower-styled solo challenges for race themed weapons!
*Main "factions" of the conflict: Bolvar and his new death knights (mostly on our side), Bwonsamdi (likewise), and Sylvanas+Meu'zala the shadow loa (main antagonists)
That's about all I can think of, but I'm more interested in what other people can come up with. Time travel? Forgotten continents? Talking bears who practice kung-fu? Actually no, that'd be silly.