TheShadow
Some interesting stuff in that link, but a lot of speculation - particularly about pilots and autopilot.
I think in yesterday's brief, NASA said 3 launches ago a similar section of tank detached. The next launch it did not, and then this launch it did. An investigation was ongoing which was to report prior to the next launch. Maybe some material change in the tank construction recently?
NoD
NB NASA news conference 2130Z tonight I think. Given the detail they gave last night - I don't think anything significant has come out since - should be interesting.