Vitalik Buterin introduced the Ethereum privacy framework Kohaku at Devcon, an open-source project spearheaded by the Ethereum Foundation. Kohaku aims to provide modular on-chain privacy and security components for the Ethereum ecosystem. The framework currently includes foundational elements that integrate protocols like Railgun and Privacy Pools, enabling developers to offer optional privacy modes in Ethereum wallets. Future developments may explore features such as mixnets and ZK browsers.