The background will never signifigantly change because it is a *background* for your games. Advancing the storyline isn't the goal, creating a unique universe is.
Any sort of radical change would have a dramatic effect on the way the armies are organized in the game. . .something that isn't really feasible to do with each army being changed only when new codexes come out.
So while it is fun to speculate on what "could happen" we all have to just realize that nothing but small changes to the background are ever going to happen.
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