If anyone is interested in updating to 10.10.2, I did it myself and its now working with my GTX 980 with the new nvidia driver update released today. Here's what I did:
1. Download nvidia drivers here:
http://www.nvidia.com/download/driverResults.aspx/81365/en-us
2. Essentially follow the directions in this post for the how-to update to 10.10.2 post here:
http://www.tonymacx86.com/os-x-updates/155489-os-x-10-10-2-update.html#post958863
3. Reboot and boot with flag "nv_disable=1"
4. Install Nvidia driver (and audio drivers in Multibeast if you don't have sound)
5. Reboot and enjoy
If this doesnt work for you, try plugging your monitor into your motherboard's graphics and then booting into OSX and installing the nvidia driver and then plug your monitor back into the gfx card.
Good luck!