If you go to joyent.com you'll see "Multi-Cloud Kubernetes" is on their homepage above the fold and listed in their products & services category. SmartOS is an operating system. Triton is a data center for running container instances. Kubernetes is a container orchestration tool. These are all solving separate problems...
Triton can orchestrate containers[1] (they're actually Solaris zones[2], to which constraints in terms of project definitions[3] can optionally be applied, and those constraints are actually containers).
