I remember they said Vulkan would come after multithreading.
This is lifted directly from the Jan 6 newsletter:
"Implementation of the Vulkan API continues in parallel with the multithreading effort. Our Vulkan renderer is integrated with the new render graph, and it benefits from multithreading by using render graph mechanics of background loading of textures and geometry, rendering objects in parallel, terrain streaming, etc. As a result, many rendering tasks submitted to the graphics card will no longer need to wait for each other and hence be processed simultaneously.
In our endeavor to unify DirectX and Vulkan renderers, we have developed a mod state where both backends produce identical results. We now have two fully compatible implementations that run under the same API. This means that all our applied graphics modules (the code that renders our skies, clouds, models, effects, etc.) will work the same way on both renderers. To achieve this, we ensured that all our shaders could be converted into Vulkan format in addition to implementing a shader converter available from within DCS permitting to compile any shader on the fly. It is interesting to note that the shader conversion has taken an inordinately large amount of time.
The main achievement in 2022 is that DCS now works under Vulkan producing the same visuals as under DirectX. This result is fully ‘transparent’ for our graphics programmers, allowing them to write the same code for both platforms without the need to have separate code paths for Vulkan and DirectX11 and beyond.
The next step is to provide our graphics programmers with the new Vulkan features compared to DirectX 11. These include new types of shaders (as per Shader Model 6 and further), ray tracing, some advanced rendering techniques, such as GPU driven rendering, and similar."