The anticipated first-gen T15g is currently thought of as the "gamer's ThinkPad", due to the RTX 20-series graphics that, as some leaks have attested, is destined for this machine. Its maker Lenovo may have put this beyond a doubt with a full product specifications reference (or PSREF) for the device, including a raft of SKUs with specific processor and graphics options.
https://www.notebookcheck.net/Lenovo-posts-a-full-product-specs-reference-for-the-ThinkPad-T15g-Gen-1-with-the-possible-configurations-available-on-its-launch.492256.0.html