This board was originally released in 2012. The one presented here comes from the translated CAD files, originally Cadence Allegro and OrCAD were used to do this design. The revision of this board is from 2013, and at the time of publishing (6/8/2016) this is the most recent set of CAD files available from the NXP web site for this board.
This is the board used by Eli Hughes' Hack It Together projects - Monkey Jam, Monkey Listen, and Monkey Do. The designs are all featured in the CircuitMaker community projects workspace.
Please see the side bar for the links to the original Freescale/NXP web site for this board. The reference design here is provided so users of CircuitMaker can fork it and develop new works based on the Kinetis K20 microcontroller.