NVIDIA's announcement just makes note of the 32-bit FreeBSD driver but does not mention any 64-bit *BSD support. NVIDIA though has told us they will deliver a 64-bit FreeBSD driver before year's end. NVIDIA is only able to finally deliver a 64-bit FreeBSD driver now thanks to mmap() extension improvements in FreeBSD 8.0. However, a keen Phoronix reader has found NVIDIA's unannounced x86_64 driver for FreeBSD 8.0.
Over at this FTP location on NVIDIA's download server is a 64-bit build of the 195.22 FreeBSD driver. This is in fact a legitimate FreeBSD x86_64 driver for NVIDIA GeForce/Quadro hardware, but it has yet to be officially announced. We suspect NVIDIA will officially announce this new driver in a short while.