Well, we can honestly only speculate until they put it out, but otherwise, check the Trello board for what is "Done" or "Doing" for the next listed update.
Currently we can tell it's a bunch of story stuff.
Mountain biome upgrade for story elements (not going into too much detail but thats the main bit) Reaper Skeletons placed in LZ plus more bits and bobs. Terror forming possibly removed and replaced by legs that change height.
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Currently we can tell it's a bunch of story stuff.
Old Stuff, Fixed...
New Stuff...
New Stuff, Broken...
And Other Things.