PAC audio has a new module that will add navigation as well as touch screen control and a camera input for the entry level radio. I'm told the Msrp will be almost $1600! It includes a digitizer for the touchscreen which will only work on the nav and camera. It also has google voice search.

 

Video of P1N-GM13:

http://vimeo.com/96840959

It shows it on a truck but it is supposed to be the same

 

I'm sorry if I replied incorrectly. I'm not sure now if the ltz non nav is the same as my ls non nav either way I think PAC also has an option for the ltz.