To simulate slide over: drag from the right edge (starting from a point very close to the edge).
To simulate split view: tap on the small white bar on the left edge of the slide-over app.
See this WWDC video.
EDIT (Thanks to @qix, @Bogdan Weidmann, @Solomon)
Supported devices:
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iPad Air+, Mini 2+ for slide over
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iPad Air 2, Mini 4, Pro for both slide over & split view
Project requirements:
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Built with iOS 9+ SDK
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Supports all device orientations
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Use launch storyboards