With the last launch of Discovery this past Monday (5th of April), it was discovered during a post launch inspections from land and ISS cameras, that a piece of tile was 'liberated' from the rudder speed brake.
Word on the street is that the rollout of Atlantis, for Tuesday the 13th of April, to the VAB, will most likely be delayed so both it, and Endeavour, can be inspected in the same region.
Of course, if the rollout is delayed to the VAB, so goes the the delay being built in for rollout to the launch pad...pushing back the 20th of April to another date yet to be determined.
Stay tuned...........