Yes, they have. To date there are 22 games announced for the PS4.
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New Final Fantasy
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Assassin's Creed IV
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Watch Dogs
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Whore of the Orient
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Driveclub
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Diablo 3
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Deep Down
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Sniper Elite 3
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Thief
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Beyond Good & Evil 2
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inFamous: Second Son
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Destiny - Pathways Out of Darkness
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The Witcher 3: Wild Hunt
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The Witness
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Killzone: Shadowfall
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Knack
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Human Element
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Primal Carnage
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Blacklight Retribution
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Carmageddon: Reincarnation
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Cyberpunk 2077
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Rocketbirds 2
Source: http://www.ps4playstation4.com/PS4-Games