The Washington Post reports,

White House press secretary Scott McClellan hinted that more documents regarding Bush's National Guard service may soon be released. Asked whether officials in the White House have seen unreleased documents, McClellan called that "a very real possibility." Other officials with knowledge of the situation said more documents had indeed been uncovered and would be released in the coming days.

How many times now has Bush released all his military records?
 

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The Associated Press filed a lawsuit sometime back to obtain Bush's military records. They reported yesterday,

A federal judge has ordered the Pentagon to find and make public by next week any unreleased files about President Bush's Vietnam-era Air National Guard service to resolve a Freedom of Information Act lawsuit filed by The Associated Press.

U.S. District Judge Harold Baer Jr. handed down the order late Wednesday in New York. The AP lawsuit already has led to the disclosure of previously unreleased flight logs from Bush's days piloting F-102A fighters and other jets.

Pentagon officials told Baer they plan to have their search complete by Monday. Baer ordered the Pentagon to hand over the records to the AP by Sept. 24 and provide a written statement by Sept. 29 detailing the search for more records.
....

Through a series of requests under the federal open records law and a subsequent suit, the AP uncovered the flight logs, which were not part of the records the White House released earlier this year.

This may explain the reason for McClellans's "hint." The Bush campaign may foresee further revelations on the way and is hastening to "innoculate" the public to any new disclosures.