I think I know what it is.
DTS is a 5.1 surround sound system. But what if you don't have surround? I believe that DTS 2.0 is a way to use the DTS audio signal even if you only have a stereo set up. So because the PS3 may in some homes only be connected to a tv with audio through the tv speakers, this means that they can still use the DTS soundtrack.
Of course, I may be wrong! but the little I could fine online suggested this is a system of using DTS on a 2 speaker system.
http://www.dtsonline.com/consumer/te...t-a-glance.php
On the above I can't see DTS 2.0, but there is DTS digital out
Also, do we assume that the DTS logo includes DTS-HD? I notice that Dolby get 2 logos.
On another tack, Sony have still to add the "wifi" logo.