850 HID support coming in Traktor 2.6!!!
Please always use the latest service update for any application or hardware
driver. You can either find the latest updates in Service Center or on our website
under the following urls:
Product Updates:
http://www.native-instruments.com/updates
Hardware Drivers, Service Center and Controller Editor:
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UPDATE: CDJ 859 HID support is not present in version 2.6 of Traktor despite NI's confirmation below. Hopefully this means they are including it in 2.6.1 or one of the next preliminary updates for the 2.6 version of Traktor.