I think they just didnt fully implement it yet - most of the ipad stuff is not done yet.
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So on ipad, yes? The whole ipad build seems pretty primitive. Maybe better on iphone?
Don't see any way to bring up Spotlight search from inside of an app unless a Keyboard is connected. Which is what you could do in iOS 13. So I don't understand what is new about this feature. But because they didn't mention it, I doubt it's coming later.