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Intel Unveils Full Lineup of Skylake Processors for Notebooks and Desktops, Early 2016 Likely for Most Macs
http://www.macrumors.com/2015/09/02/intel-skylake-notebooks-desktops/

MacBook Air
Intel says that Skylake "U-Series" processors with integrated Iris 540 graphics will not begin shipping until early 2016, making the MacBook Air an unlikely candidate for a refresh through at least the remainder of the year.

13" Retina MacBook Pro
Intel Skylake "U-Series" processors with integrated Iris 550 graphics, the successor to Intel Iris 6100 graphics,
will not begin shipping until early 2016, meaning the 13-inch MacBook Pro is unlikely to be refreshed through at least the remainder of the year. Early 2016 appears to be a more likely target.

15" Retina MacBook Pro
Apple may elect to skip a Broadwell refresh of the 15-inch Retina MacBook Pro and wait for Skylake early next year.