It looks like Summit is slowly picking up their marketing pace for Ender’s Game. You can now pre-order the official soundtrack written by Steve Jablonsky HERE on Amazon.com. It will be released on October 22 and will cost around 17 USD (16.77 at Amazon, 17.98 retail price estimated by record label Varese Sarabande). There are no audio clips available yet, but the record label has published the back cover of the CD with its track list. (Check out their official EG soundtrack page HERE!)
Sources: Amazon, Varese Sarabande