Core Lightning v26.04 introduces several new features and improvements for both users and developers. Key highlights include the ability to splice funds into and out of channels, improved payment reliability through parallel pathfinding, and a new currency conversion plugin. The release also enhances developer capabilities with dynamic REST API endpoints and improved backend reliability. Splicing is now enabled by default, and support for the legacy onion format has been removed. This update aims to streamline operations and enhance user experience on the Bitcoin Lightning Network.