This is something that I was keeping a close eye on. Before this used to be quite expensive. However now, if you' subscribe to Sky TV and Sky VIP, you can pick this up for £189.
The Sky Soundbox is made by Devialet, who makes premium French audio equipment.... So the quality is quite good.
The Sky Soundbox is basically a black soundbar, 37.5cm wide and 21cm deep.
It has a total of nine speakers of different sizes and orientations (140 Watts total) which work together to produce a wide soundscape.
If those that don't subscribe to Sky, then its quite expensive and I wouldn't bother.