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The iPad mini identifies itself to OmniFocus as an iPad 2; the full-size ones didn't/don't support Siri; our code looks at the device identifier and leaves the feature switched off for that reason.

Of course, the iPad Mini *does* support Siri, so now that we have some units to work with/test on, we'll push out an update that will enable it. ("Original" iPad 2's still don't have Siri, so nothing changes for folks using those.)