We're not sure how long they've managed to keep this under the radar, but it looks like Vizio has been working on a wireless speaker set up dubbed the Jive. It's still a little unclear how it works, but it appears that the TV (perhaps a new Vizio TV?) will have built-in wireless and transmit audio to a receiver embedded inside a subwoofer, which in turn will have connections for your rear speakers (the TV's built-in speakers will double as the front speakers). With the exception of a few Aquos models, I haven't really been impressed by most TV's built-in speakers, but Vizio's concept sounds intriguing. Pricing and availability are up in the air, but we'll have more details as soon as we get 'em.
Vizio Jive Wireless Home Theater System (item 9) [Sci Fi Tech]