Thanks. I've checked that xserver-xorg-video-nv (non-free, meant for kfreebsd systems) still builds OK with xorg-video-abi-18, xserver-xorg-core (>= 2:1.15.99.903). I don't have hardware available to test it with unfortunately.
I can confirm that xserver-xorg-video-nv works under kfreebsd-amd64: NVIDIA Corporation G73 [GeForce 7300 GT] (rev a1) xrandr -q Screen 0: minimum 640 x 400, current 1920 x 1080, maximum 1920 x 1080 default connected 1920x1080+0+0 0mm x 0mmii xserver-xorg-core 2:1.15.99.904-1 ii xserver-xorg-dev 2:1.15.99.904-1
It remains to upload it into unstable by some DD. Cheers Petr