Today, Microsoft Download Center appeared a "... Windows Automated Installation Kit Documentation (Windows Server code named " Longhorn" & Windows Vista SP1 Beta 3)" More than once (Long Zheng said, but I only saw it once...) Vista SP1 is clearly mentioned, which shows that Vista SP1 is not far away from us.
Please note that Beta 3 does not refer to SP1 Beta 3, the correct understanding should be that this WAIK is in Beta 3 stage.
The RTF document in the downloaded zip package is dated March, and the date written in the document is February, it is really confusing, I don't know which is right.
After going through the documentation, I found no new feature information for SP1, but there is an unattended installation.