Canon 1D X officially pushed to late April
Canon Japan has officially announced that the new Canon 1D X and its assorted new accessories have been pushed from a late March to a late April 2012 estimate release date according to DC Watch Impress (computer-translated). The computer-translation says this was caused by "delays in development". This could mean that the Nikon D4 might be released first since some pre-order estimates point to late March - assuming those estimates are accurate and they do not change later on.
Also rescheduled for later on are the 500/4L IS II and 600/4L IS II according to DC Watch.