Depending what country, in the UK it isnt available yet as far as i know.
Here is a small bit of info i found on the system
An interesting Hi-Fi system known as the interscope sound System', It comprises 8 speakers(2 tweeters and 2 woofers in the front and rear door panels, a 100W subwoofer and a 30W amplifier), It employs a particularly sophisticated technique to process the sound, developed with SRS Labs. What makes the sound experience on board the car really unique is the fact that the new system uses SRS 3D, Focus and TruBass effects simultaneously. The first method (3D) spartially equalises stereo reproduction, exploiting the position of the speakers and improving the spartial perception. The second method (Focus) raises the sensation of listening to top speakers positioned higher than they actually are, and improves acoustic efficiency by adjusting the frequencies perceived by the human ear. And finally, the third method (TruBass) extends the perceived frequency field towards the Bass, enhancing the effect of the subwoofer so that the listener feels he is listening to a system that produces extended, very deep basses. The result is a more enveloping sound, which recreates a correct stereophonic effect even for listeners who are positioned some away from the symmetrical axis of the speakers (as in the case of the car).