The document discusses the new Apex Interactive Debugger being released in Winter '16. It provides an overview of the key elements, including an Eclipse plug-in, debugging API, and session manager. It notes that the debugger is an add-on product that must be purchased, as debugging sessions are a limited resource that could otherwise slow down orgs. Debugger sessions will be shared across development teams and only run in sandboxes. To use the debugger, sessions must be purchased and the Eclipse add-on installed.