So far, the reason is unknown, but the next Sea Launch mission (Galaxy 18) has been pushed back 14 days - now listed for May 27th.
No new date for the launch following that one (Echostar 11) has been posted yet.
Sea/Land Launch schedule - Viewing a thread
No new date for the launch following that one (Echostar 11) has been posted yet.
Sea/Land Launch schedule - Viewing a thread
