OpenTofu 1.8.0 has been released, introducing several highly anticipated features that make it easier for users to transition from Terraform. Key features include early variable/locals evaluation, .tofu file extensions, and enhanced testing capabilities. The new version allows variables or locals when using module sources and versions, making automation more efficient. Additionally, OpenTofu 1.8 prioritizes .tofu files over .tf files, enabling developers to write a single configuration file for both OpenTofu and Terraform. Furthermore, the release introduces mocking capabilities in unit testing, allowing users to override resources, data sources, and modules from their tests. Spacelift supports OpenTofu 1.8 natively, offering seamless integration with its features.