The Ethereum Foundation announced the launch of the Ethereum Execution Layer Specification (EELS) and hopes it will serve as the default method for designated core EIPs

ChainCatcher message, the Ethereum Foundation officially announced the launch of the Ethereum Execution Layer Specification (EELS) after more than a year of development. EELS is a Python reference implementation of the core components of the Ethereum execution client, focusing on readability and clarity, making it more programmer-friendly and keeping in sync with the post-merge forks. EELS provides a complete snapshot of the protocol at each fork, making it more convenient to execute compared to the "just change" specifications of EIPs and the production clients with "unified code paths appearing in multiple forks." The Ethereum Foundation hopes that EELS will become the default way to specify core EIPs.