The new Win 10 NVIDIA GeForce driver is here, in two different flavours depending on your form factor.  If you spend the money for a gaming laptop with a GeForce 600M through 900M then this is the driver for you.  On the other hand if you have a traditional desktop and a GPU or two then head to this page.

If you have a Sony laptop you should double check your GPU is covered and unfortunately at this point Hybrid Power technology is not supported.  NVIDIA did not provide much additional information on the desktop side; it is a beta and so is the OS so make sure to record the full information about your bugs and crashes when reporting them, not just a frowny face followed by expletives.