Besides some new SLI profiles, the 418.81 WHQL release also promises performance improvements on multiple games, including The Witcher 3, when using G-SYNC and SLI on Pascal and Maxwell based GPUs.
There are also some bug fixes:
Gamestream][OS HDR]: Stream is not set to launch in HDR despite having HDR display attached to the PC and client. [2467526] [GeForce Experience]: Share FPS overlay appears in the Twitter UWP app from the Microsoft Store. [2465033] [G-SYNC]: Flickering may occurs in games if G-SYNC is enabled. [2399845] [G-SYNC]: With G-SYNC enabled, after hot-pugging a G-SYNC display and then a GSYNC Compatible display, the right half of the G-SYNC Compatible display may go blank. [200484819]