Terraform 0.12 introduces improvements to its configuration language, allowing for additional templating of Kubernetes resources. This version enables the use of first-class expressions, such as `var.namespace`, without variable interpolation syntax, reducing duplication in configuration and enabling easier deployment of Kubernetes services like ExternalDNS and Fluentd daemonset. Additionally, Terraform can now be used with Helm to deploy charts and run tests, streamlining the deployment process for applications packaged with Helm. By leveraging these improvements and providers, users can seamlessly pass attributes from infrastructure resources into Kubernetes clusters, minimizing additional automation and enhancing their development workflow.