At time of print very few details are avaliable, however the drivers are currently on the nvidia jp site (still waiting for the US and other countries to update) More details to follow.
Download: Detonator 4 v21.81 Japan (3.74MB)
Download: Detonator 4 v21.81 USA (3.74MB)
PS: Servers are getting hammered, be patient.
Thanks to MaxReboot for the release notes that are listed inside this post (click read more)