Calibre 8 introduces major improvements like enhanced Kobo support with native KEPUB handling, folder-based device connections, and refined author name handling. The update includes bug fixes for text searching, metadata editing, and viewer functionality. Notable features include customizable web search links, new icon management options, improved series name transformation rules, and enhanced content server capabilities. The release also updates various news sources and adds quality-of-life improvements to the interface and metadata handling systems.