JSF 2.0 (JSR 314, http://jcp.org/en/jsr/detail?id=314) specification, maintenance release 2, section 10.1: 'Facelets is a replacement for JSP that was designed from the outset with JSF in mind. New features introduced in version 2 and later are only exposed to page authors using Facelets. JSP is retained for backwards compatibility.'
