A:Answer Basically the a6300 is a professional version of the a6000, most significantly it now features an updated crop sensor for better performance (Sony switched to using coper traces in the sensor for better dynamic range and improved low light performance, its not a hugely dramatic improvement over the previous sensor, but its a welcome upgrade, it also has far more autofocus points, so expect even better focusing than the a6000), and the ability to shoot 4K video. It also has a magnesium alloy body as opposed to the a6000's plastic body. Sony also chose to include the digital viewfinder from the A7, so it now has an almost full HD viewfinder.
Basically, its a stopgap between the A7II and the a6000, though it has some stuff that the A7II lacks, like 4K video and faster autofocus.