We still have much to learn about Intel's Gen12 GPUs, but it turns out that Intel published information about the Xe-HP architecture in January. Spotted by @KOMACHI_ENSAKA in open-source documentation, the Xe-HP architecture will be the basis of workstation and high-end GPUs.
https://www.notebookcheck.net/Intel-Xe-HP-High-Performance-DG2-GPU-spotted-in-open-source-documentation.460243.0.html