NASA sources report that the Orion PDR (Preliminary Design Review), which was originally planned for September 2008 and then slipped to November, will be delayed much further - perhaps as far as mid-Summer 2009.
Earlier postings.
Orion PDR Slip, Earlier post
Constellation Update, Earlier post
NASA Internal Memo: Orion DAC2 Architecture Closure Plan Rev E, 2/19/08, Earlier post
Chart from NASA Internal Presentation: CxMPR, Orion Project Office, 2 July 2008