It might just be my brain being fuzzy because it's nearly seven in the morning and I've slept less than I'd like to but you know what I'd really like to see from a Cabal-centric expansion?
A Fallen ketch cruising across the sky, on its way to some vital thing and of course the Guardians must stop it. We land at the objective and look at this vessel from a distance, Ghost begins to warn of something only for that warning to be drowned out by the Ketch being absolutely obliterated by a Cabal ship in orbit.
Why do I want to see this? Because it seems as though the Grimoire is painting the Cabal as the largest source of physical power amongst our enemies, but I really don't feel like that's the case in what we have seen of them thus far. There's nothing truly intimidating about the Cabal we fight in game other than their size. I imagine people in the city are more afraid of a Fallen Dreg than a legion of Cabal Colossi.
I want to see the Cabal rebound from TTK in a big way, I want to see the Dreadnaught lose a chunk of its stern, I want to see Vex glassed from orbit, Hive vaporized by landing craft, Fallen literally scattered to the wind, and above all else I simply want to see the Cabal military, the true military, live up to the reputation Ghost gave them all the way back in September 2014.
That's just me though. I can't speak for anyone else afterall.
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The desolation of Phobos