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You are forgetting webRTC.

(peer 2 peer data connections)

I think WebRTC is going to be more of a 2014 technology – it's still pretty raw as a technology, and even more so as implements, going into 2013.

why do you say that? several groups looking to replace flash with webrtc based video chat (opentok) and they already have some basic support.

I'd rather hope Chrome open API for its XMPP connection. Which is currently used for Chrome Sync.

You can build p2p video, audio, multicast, real-time notification, etc. wrapped in a industrial level message channel.