Curiosity appeased!
So, reading the announcement, the new creature is your imaginary friend, and the new death is by chemistry set. This sounds like an amazing EP, and I can see why they've left it until now to do this one. All the other EPs have added lots to the game, more so in terms of new jobs and objects, more like exanding the base game with the, very different, EPs. Generations, I feel, will bring them all together. Plus they have filled in the gaps, with more things to do with kids (pre-YA), and of course, elders.
Very clever, and well-done EA.