DirectTV will again be covering BlizzCon via a Pay-Per-View event, and is also going to offer a streaming internet video of the same feed. Price is $39.95 USD, and includes code for the companion Deathy and the StarCraft IIGrunty portrait
There will be four (4) different coverage channels for the entirety of the event.
Sites with Semi-Live Coverage:
WoW.com (Unconfirmed, placed for future sites as an example, but then again, they do this every year).