Default Double Tap To Wake In Kitkat Update ?

Recently Sony D6503 aka Sony Sirius New UI Screenshots Leaked, its running kitkat 4.4.2 ,i found one interesting feature in it double tap to wake or lock, At present sony has only display technology is triluminous display z ultra,z1,z1 compact even sony sirus D6503 has triluminous display , so can we expect double tap to wake or lock in sony z ultra in kitkat 4.4.2 update ?

Sony D6503 aka Sony Sirius New UI Screenshots - http://goo.gl/vp3V1D

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