Probably a bit early in the development process, but I am very curious about what the plan is for running Javascript on the M4 core? My research shows up a few methods but I am not sure how stable or user friendly they are:
I'm interested in this too. The ability to use micropython/javascript is what originally interested me in the board. Hopefully they come out with something soon.
I think the micropython tutorial is on it's way and would be posted on the Arduino PRO tutorials using this link https://www.arduino.cc/pro/tutorials/portenta-h7. It is not yet there. I really hope a javascript tutorial is going to be posted but I am not going to hold my breath.