I'd like to see something big, like the Tau, Necrons, or Ad Mech get completely wiped out.
I know that wouldn't happen due to sales and fan outrage, but I'd like to see the fluff about a key player in the universe being annihilated. Maybe Daemons destroy every holding the Tau have encroached into, perhaps the Inquisition mounts an army and turns the Necrons to dust, or the Eldar dance over and blow up Mars with scatter bikes.
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Personally I wouldn't mind if all the characters who can't die due to some magical bull**** gained a bit of mortality, like daemons become killable, not easily, maybe you need their true name but it would be nice if they were mortal, also any of the perpetuals, like if the emperor could actually die I may be slightly worried, underscore the point by offing a major character, maybe Logan Grimnar, or Ku'Gath also bring back rules for all the interesting DE characters, I want to see the fruits of Khedrukah's grand scheme
Also off Lucius the Eternal and make the Slaneesh character for CSM more interesting
Captain Tycho died during the Third War for Armageddon.
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I wouldn't mind seeing a schism in the Mechanicus - perhaps relating to the re-discovery of particularly potent STC stuff. Some feel it's sanctioned, others that it needs to be buried.
There's a myriad of reasons for that sort of split, so no need to spell it out for the players, let us interpret it our own way.
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