Hi, mediasoup 3.1.0 has been released.
It comes with VP9 SVC support (including full SVC and K-SVC) among other improvements.
To properly know about simulcast and SVC support in mediasoup, check the corresponding documentation:
The mediasoup demo application can also enable VP9 SVC and comes with screen sharing capabilities. Check the “devel:vp9” gulp task in the app gulpfile.js file to see how to enable VP9 SVC.