CDI is the Java standard for dependency injection (DI) and interception (AOP). It is evident from the popularity of DI and AOP that Java needs to address DI and AOP so that it can build other standards and JSRs on top of it. DI and AOP are the foundation of many Java frameworks, and CDI will be the foundation of many future specifications and JSRs.
CDI Source announcement from Rick Hightower
CDI and Spring integration announcement. (Part of CDI Source.)