Another significant upgrade is NVIDIA's Advanced Optimus technology, essentially a controller that chooses either the GPU or integrated graphics for a given app. Before, the GPU wasn't directly connected to the display and had to drop frames onto the integrated graphics framebuffer. Now, it can drive the built-in display directly, improving latency and allowing G-Sync to work at up to 4K 120 Hz. The GPU is also now directly connected to the DisplayPort on your laptop so you'll see improved performance when using VR or an external monitor.
Since all of this new tech is hardware dependent, it will only work on the latest RTX and GTX laptops and not your pre-2020 RTX 2080 Max-Q model, for instance. And for now, it will only work on Intel-powered laptops, but NVIDIA did tell Engadget that it would come to AMD models "in the near future."