Why didn't BRL announce this?
Maybe because it is still a work in progress (experimental module).
And of course
- a new MaxIDE with support for the new parameter H (threaded) is needed;
- testing of the collateral effects...
- time to write a 'basic' tutorial & some documentation
Some of us are waiting multithreading support for years, I think they/we can wait until BRL/Mark finishes the job. Asking now is premature (in my opinion).