We weren't sure it would actually be released but as it turns out that AMD Ryzen 7 5800X3D CPUs are now being manufactured. 

The first retail shipment of these processors could arrive by the end of the month, according to dataminer Greymon55 (the end of March, 2022).

Featuring three-dimensional stacked-die architecture, the 5800X3D is the world's first consumer processor with this feature. Due to the inclusion of AMD's 3D Vertical Cache, the processor's on-die cache is increased from 32 megabytes (MB) to 96 megabytes (MB), allowing each of the processor's eight "Zen 3" cores to access the additional memory. When it comes to gaming performance, AMD believes that the "Zen 3" processor with 3D Vertical Cache provides significant improvements.

AMD Ryzen 7 5800X3D ships and could be available by the end of March.