Hard news about the release date of the Windows Vista SP1 still doesn't exist, but a bit of information has slipped out and given up a bit of food for thought on what SP1 will contain.
ENT News today has a list of 22 possible fixes, gleaned from the temporary release of a couple of actual updates from a set of beta fixes on the Windows Connect Web site. After the fixes and references to Knowledgebase articles were removed from the site, Microsoft wrote to a media group that the fixes would be released through Windows Update ... some time.
Microsoft has alternately downplayed the importance of an SP1 and played with the secrecy surrounding it since before Windows Vista was released to the general public. Both tactics have seemed to have the same result: stirring up anticipation for the set of fixes. After all, many good-sized organizations have set policies that they will not begin Vista rollouts until after SP1.
Some are assuming that the public Vista SP1 fixes will be released -- through one method or another -- on the next Patch Tuesday, August 14, but it's only an assumption.