In a rather unusual turn of events, the release date for the impending Lucky Star OVA has been pushed back an entire month, from August 29th to September 26th. The change has shown up in several different shops, so it can likely be taken as genuine. There is no official statement on why at this time, so we’ll just have to speculate wildly.
There was some interesting talk on 2ch that this could be connected to revisions after the recent incident, but of course that is pure speculation. Via 2ch, visible here.