Will this run on GPU or on the CPU? This feature will use 3DGS particles? It will work on AMD cards? When it will be released? I wrote a subtitles system a while ago. Can I become a beta tester?

It was planned to run on the GPU and not use 3DGS particles. You can be a beta tester, but since 3DGS development is currently paused, there are no betas at this point and I cannot say when the fluid system will be added.