Unfortunately, no testing is required. kldload fails stating that there is no such file or directory as nvidia, but I suspect the real problem is what ends up in my logs:
Nov 21 10:38:39 illusion kernel: link_elf: symbol cv_wait undefined
The only things I've been able to find referring to cv_wait and the FreeBSD nvidia-driver were those related to it being called with the wrong mutex. I also tried the beta drivers you posted, but I had the same results.
Any ideas on this one?