NVIDIA has 8 GB and 16 GB editions of the GeForce RTX 3070 mobile in development, PCI IDs have confirmed. Expectedly, there will be Max-P and Max-Q versions of the GA104-M based GeForce RTX 3070, as there will be for the GeForce RTX 3060. The latter will be based on the GA106M GPU.
https://www.notebookcheck.net/NVIDIA-is-developing-the-GeForce-RTX-3070-Max-P-and-Max-Q-with-8-GB-and-16-GB-of-VRAM-GA106M-for-the-RTX-3060-Max-P-and-Max-Q.508859.0.html