.NET 6 for Rhino 8?

[Japhy]

It will, but not sure when it will be added to the WIP and eventual Rhino 8 release.

This is still the best answer

.net Core Plugin?

Rhino 8 for Mac is currently using .NET 6. We are investigating the use of .NET 6 in Rhino 8 for Windows, but it is still currently using .NET 4.8. Windows is a trickier situation because we still need to support execution in a .NET 4.8 runtime to support certain Rhino.Inside implementations.