They say lightning never strikes twice but it did today, exactly the same reason for launch scrub as STS119. The reason for the scrub was a leaking H2 gas vent on the outside of the upper portion of the shuttle external fuel tank. Now this has happened on two occasions so close together there will probably be a major review of procedures to prevent this happening again on future launches.
Last time this happened the problem was resolved successfully within the predicted timescale on STS119, so assuming nothing unusual is found after inspection on Sunday the main debate will center around the impact on the LRO/LCROSS mission which was scheduled for launch on 17th June. Due to the number of days required for pre and post launch work by the ground support crews its becomes very difficult to overlap launches at Cape Canaveral and Kennedy Space Center.
With the looming ISS Beta cutout, ISS build/servicing schedule, Soyuz docking, termination of Shuttle program etc... it seems fairly likely that STS-127 will get prioritised and LRO/LCROSS will be bumped by NASA to the next available launch window in 2 weeks, unless they can figure out a way of overlapping launch windows for both STS127 and LRO/LCROSS.
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