The leaks allegedly come from sources attending Nvidia's latest AIB partner briefings on the upcoming Amere GPUs that are scheduled to launch in 1H 2020. Among the improvements rumored to come to the RTX 3000-series, the leaks point to greatly increased ray tracing performance, boosted rasterization capabilities, more VRAM for each model, slightly higher clocks, but lower TDPs and voltages that could lead to limited overclocking range.
https://www.notebookcheck.net/Fresh-leaks-detail-Nvidia-s-Ampere-GPU-specs.440537.0.html
...and the laptop versions are a further half cycle away...seems that waiting is always the best idea.