At this year's IDC event in Tokyo, Intel disclosed a few more details about the upcoming Xe GPU architecture. Besides the hardware-level ray tracing support on the discrete GPUs launching in mid-2020, Intel also intends to double the performance of the current Ice Lake Iris Plus iGPUs on the Gen 12 Xe GPUs integrated with the Tiger Lake CPUs.
https://www.notebookcheck.net/New-Intel-Xe-GPU-info-Gen-12-mobility-iGPUs-designed-to-deliver-1080p-60fps-gaming-discrete-GPUs-to-get-ray-tracing-support.437548.0.html