Some days ago the Microsoft Powershell Team released the Community Technology Preview of the Windows Management Framework 3.0 which includes Windows PowerShell v3. You can download the the CTP1 here and it requires Windows 7 SP1 or Windows Server 2008 R2 with SP1.

You can use very easy both PowerShell versions sie by site.

powershell.exe -Version 3.0

powershell.exe -Version 2.0

But the Windows Management Framework 3.0 CTP1 does not only includes PowerShell 3, it also contains new versions of WMI, WinRM and the new Windows PowerShell Webservice.

Windows PowerShell 3.0

• Workflows
  Workflows that run long-running activities (in sequence or in parallel) to perform complex, larger management tasks, such as multi-machine application provisioning. Using the Windows Workflow Foundation at the command line, Windows PowerShell workflows are repeatable, parallelizable, interruptible, and recoverable.
• Robust Sessions
  Robust sessions that automatically recover from network failures and interruptions and allow you to disconnect from the session, shut down the computer, and reconnect from a different computer without interrupting the task.
• Scheduled Jobs
  Scheduled jobs that run regularly or in response to an event.
• Delegated Administration
  Commands that can be executed with a delegated set of credentials so users with limited permissions can run critical jobs
• Simplified Language Syntax
  Simplified language syntax that make commands and scripts look a lot less like code and a lot more like natural language.
• Cmdlet Discovery
  Improved cmdlet discovery and automatic module loading that make it easier to find and run any of the cmdlets installed on your computer.
• Show-Command
  Show-Command, a cmdlet and ISE Add-On that helps users find the right cmdlet, view its parameters in a dialog box, and run it.

WMI

• A new provider development model
  This new model brings down the cost of provider development and removes the dependency on COM.
• A new MI Client API to perform standard CIM operations.
  The API can be used to interact with any standard WsMan + CIMOM implementation, allowing management applications on Windows to manage non-Windows computers.
• The ability to write Windows PowerShell cmdlets in native code
  The new WMI Provider APIs supports an extended Windows PowerShell semantics API allowing you to provide rich Windows PowerShell semantics. e.g., Verbose, Error, Warning, WhatIf, Confirm, Progress

WinRM

• Connections are more robust
  Session disconnect and reconnect, with or without client session reconstruction, allows long-running tasks to continue even when the session in which they were started is closed and the client computer is shut down. This feature also allows administrators to reconnect from different computers to check the status of remote running tasks and get results.
• Connections are more resilient
  In Windows PowerShell 3.0 CTP1, connections can survive short-term network failures; the client-server connection is not severed at the first sign of trouble. If network problems persist, the client is safely disconnected and can reconnect by using the Connect-PSSession or Receive-PSSession cmdlets.

Windows PowerShell Web Service

Windows PowerShell Web Service enables an administrator to expose a set of PowerShell cmdlets as a RESTful web endpoint accessible via the Open Data Protocol (OData). This provides remote access to invoke cmdlets from both Windows and non-Windows clients.

You can get more Information about the Windows Management Framework 3.0 Community Technology Preview on the Windows PowerShell Team Blog.