I just got my hands on a copy of Windows Vista Beta 1. Looking at the files on the DVD (yes, you cannot use it without a DVD drive) it seems that the unattended text file is now in .XML format. Over the weekend I am going to edit the file as shown below and add the file to a floppy and see if it pulls the information just like the old .txt file used to. Expect to see a few blogcasts by Monday where I will show some of the new features of Vista.
<unattend xmlns="urn:schemas-microsoft-com:asm.v3">
<settings>
<component name="Setup">
<!--The elements in this section contain elements for pre-populating end user information and personalizing the end user experience-->
<UserData>
<AcceptEula>yes</AcceptEula>
<FullName ShowUI="no">User</FullName>
<Organization ShowUI="no">Microsoft Corp.</Organization>
<!--Using "*" as the computer name causes setup to provide a random computername-->
<ComputerName ShowUI="no">Computer</ComputerName>
<ProductKey ShowUI="no">XXXXX-XXXXX-XXXXX-XXXXX-XXXXX</ProductKey>
</UserData>
<DiskConfig ShowUI="no">
<Disk ID="0" WipeDisk="no">
<Partition Action="Modify" PartitionID="1" Label="" Letter="C" Format="no" Extend="no" />
</Disk>
</DiskConfig>
<ImageInstall>
<Image>
<InstallTo ShowUI="no" DiskID="0" PartitionID="1" />
</Image>
</ImageInstall>
<!-- The elements in this section contain details about joining a machine to a Domain and creating new user accounts on the local machine.-->
<Security>
<JoinDomain Username="ntdev\user" Password="cleartext" MachineDomain="ntdev"/>
<!--This section allows for multiple user accounts to be created on the local machine. You can also add the Domain user as an administrator. Users accounts specified here will be added to the administrator group by default.-->
<Accounts ShowUI="no">
<!--If your password includes an "&" character then you must specify it as & -->
<Account Username="Administrator" Password="Blank&999"/>
<Account Username="ntdev\user" Password="cleartext" Group="Administrators"/>
<Account Username="Power" Password="" Group="Power Users"/>
</Accounts>
</Security>
<!--This element allows for a user created in the <accounts> section to autologon to the machine and run the scripts specified in the <RunOnce> section. -->
<AutoLogon>
<Logon Username="user" Password="cleartext" Domain="ntdev" Count="9999"/>
</AutoLogon>
<Hardware>
<DisplayAdapter HRes="800" VRes="600" ColorDepth="16" RefreshRate="70" />
</Hardware>
<!--The elements in this section contain commands to execute the first time a user logs on to the machine. The executable runs in the context of the currently logged on user.-->
<RunOnce>
<Executable CommandLine="foo" Description="foo"/>
<Executable CommandLine="bar" Description="bar"/>
</RunOnce>
</component>
</settings>
</unattend>