Hi rjperez71.
Let me just clarify the situation. The chip Spartan6 is actually supported since some of our CompactRIO boards actually have that chip family, as you can see on this page "What Xilinx FPGA Chips Are Used by National Instruments RIO Devices?".
However, this does not mean that you can programm any device with an integrated Spartan6 chip. National Instruments have developed the LabVIEW FPGA module to only program its propietary boards (cRIO, sbRIO, FlexRIO, etc.). There are some exceptions like the Spartan-3E Starter Board that can also be supported by the LabVIEW FPGA module but its just a couple of them. Even though your board has exaclty the same FPGA chip, let's say Spartan6, you cannot program it with LabVIEW FPGA unless stated on the supported devices, which probably will only be NI propietary.
To answer the original question, there is still no support for the Nexys3 board under LabVIEW FPGA. But if you are looking for something similar, I recomend you take a look on this new product "NI myRIO"
Francisco S.
National Instruments
Account Manager
www.ni.com/soporte