No P2P in Windows Metro applications?

In the "A .NET developer's view of Windows 8 app development" session at BUILD, the lecturer mentions that only the client-side WCF features are exposed in the Metro profile, we cannot create a server. ( http://channel9.msdn.com/Event开发者_如何学Gos/BUILD/BUILD2011/TOOL-930C?format=progressive @ ~34:00)

Does this mean that direct peer to peer communication is not possible for Metro applications, and any data exchanged between 2 users over the internet will always have to actually travel through a non-metro-style application?

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Access to sockets is controlled by the "Internet (Client & Server)" capability, if this capability is enabled in your application, you should be able to send and receive data over the internet.

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Since the Metro style apps can't run on background, and are designed to be used fregmentedly, making it P2P enabled makes little sense.