For v3.0, we're starting from scratch, with a completely new architectural design in mind, to make future development easier.
Plans include:

• new repository layout
  • this will also enable others to use k3d as a module (e.g. create clusters from within other Go programs)
• a new CLI, inspired by kubernetes/kubectl and kubernetes-sigs/kind
  • new syntax (e.g. k3d create -n test becomes k3d create cluster test)
  • new library (spf13/cobra)
• a new logging library (sirupsen/logrus)
• consistent error handling
• multi-master support (k3s v1.0.0+)
• many new features