SpaceX spokesperson Kristin Brost Grantham sent out the below update this afternoon:
After reviewing our recent progress, it was clear that we
needed more time to finish hardware-in-the-loop testing and properly review and
follow up on all data. While it is still possible that we could launch on May
3rd, it would be wise to add a few more days of margin in case things take
longer than expected. As a result, our launch is likely to be pushed back by
one week, pending coordination with NASA.
We will send out an announcement when a new target is set.
Over on Twitter, SpaceX CEO Elon Musk sent out this message:
Am pushing launch back approx a week to do more testing on Dragon docking code. New date pending coordination with @NASA.
And so we can continue to wait for history to be made ...
UPDATE April 24, 2012 7:15 PM EDT — SpaceX sent out a press release this evening announcing that both NASA and Cape Canaveral Air Force Station have agreed to set a new launch date/time of 9:38 AM EDT on Monday May 7.