From
DTS Online -
7. What is Neo:6?
DTS Neo:6 is an advanced matrix decoder. It will take any two-channel source and expand it into five or six channels, depending on the user’s speaker layout. Two-channel sources include VHS tapes, broadcast televi-sion, stereo CDs and DVDs. DTS Neo:6 provides separate, optimized modes for stereo music materials and matrix surround motion picture soundtracks. DTS Neo:6 also decodes a center-surround channel from Extended Surround matrix soundtracks.
Sounds the same kind of thing as ProLogic II.