Actually Rhea was "known" for awhile, but reading between the lines, looks like it got delayed and updated: https://www.anandtech.com/show/16072/sipearl-lets-r

Actually Rhea was "known" for awhile, but reading between the lines, looks like it got delayed and updated: https://www.anandtech.com/show/16072/sipearl-lets-rhea-design-leak-72x-zeus-cores-4x-hbm2e-46-ddr5 https://www.anandtech.com/show/16072/sipearl-lets-rhea-desig... (Neoverse V1 and HBM2e woild make this chip kinda old when its finally operational). CPU design takes many years, and this was a HPC only chip, so it doesn't necessarily need to be marketed and paraded around, and the workloads will be totally different than what Graviton processors run.