As of now Sony A6300 is not supported in Lightroom CC.
You may always refer to the following link for the list of Camera supported by Lightroom : Cameras supported by Adobe Camera Raw
The question was "when" not "if" A6300 is supported. It is not supported - it is obvious, the question is when can we expect the camera will be supported?
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As of now there is no expected date, however it could be possible it will be supported with the upcoming update of Lightroom.
And when will that be?
Lightroom gets updates approximately at three month cycles for raw support and bug fixes. The last such update was on January 27th 2016. You will need to wait a month or two,
Adobe does not provide info on when updates will be released.
The link above is a good one to monitor as it provides official information about Lightroom and related applications as it happens.