With the Changelings made allies for a while now, Tirek dead, and Starlight seemingly reformed if not defanged, what threat is next to strike this version of Equestria?

We still need the Crystal Castle unlocked.

Perhaps the movie?

Tempest vs Page?

Might be interesting to see weather or not page gets captured for the weird ritual drain thing.... Also what would happen if a normal pony held it as it shattered (did it shatter in the movie? I don't remember)

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I'd like to see that.

Tempest Shadow vs. Lord Blank Page, Lady Sunset Shimmer - both trained warmages? Heh. Yes, I'd like to see that.