Must be on the mailing list at StyxWorld.com, which requires an email address.
Sign up for mailing list at: The Official Online Store of StyxWorld.com: Ticket Presales, CDs, DVDs, and Official Band Gear.
Once signed up, download new song "Difference in the World" here: The Official Online Store of StyxWorld.com: Ticket Presales, CDs, DVDs, and Official Band Gear.

Downloaded MP3 is 3:38 in length, 320kbps quality, 8.5mb in size. Enjoy!