The 64-core reward has been added as a selection. Note that the 64-core version at $199 is only possible if we reach our stretch goal of $3M. If we don't, the reward defaults to a pair of 16-core version boards.
Here is the reward in detail:
64-CORE: You get everything in the SUPPORTER reward and a 64-core Epiphany-IV based Parallella board (2 ARM cores and 64 Epiphany cores) if we reach our stretch goal of $3M. If we don't reach our stretch goal but meet our minimum funding goal, you will receive a pair of Epiphany III boards (2 ARM cores and 16 Epiphany cores). Both boards come loaded with the development software needed to create your own innovative projects. (International order should add $20 to the pledge amount).
The Adapteva Team