Group buy will open up soon.  In my own code it is a one line change to support the XUPVVP-VU9 but I am also supporting the XUPVVP-VU13.  These cards have many advantages over the Xilinx cards (30% and 80% faster, default water-cooling,  plus dynamic voltage control and automated reboot capability).  My rig is made of Xilinx cards because that has been all that was available, but my next rig will be Bittware cards for sure.