According to PowerShell guru Jeffrey Snover, PowerShell will be included in Microsoft's Common Engineering Criteria (CEC) starting in Fiscal year 2009 (July 1, 2008). This means that it will be part of server products that ship from fiscal 2009 forward. Snover says that there are over 20 groups inside Microsoft working on PowerShell support for their products. http://serialseb.blogspot.com/2007/11/teched-what-new-in-powershell-v2.html
Here's the PowerShell team blog: http://blogs.msdn.com/powershell/default.aspx