HMXHenry, a dev on the Rock Band Forums says,
"The DLC for the week of Sept 9th will be a 3 pack from the metal band All That Remains. The track listing and pricing is below.
ALL THAT REMAINS 3 PACK - $2.99 (240 Microsoft Points)
THIS CALLING - $.99 (80 Microsoft Points)
CHIRON $.99 (80 Microsoft Points)
TWO WEEKS $.99 (80 Microsoft Points)
Two Weeks and Chiron are exclusive to Rock Band for one week before their new album Overcome is released on September 16th.
Each track will be available for a one month special offer of $.99 (80 Microsoft Points) per track or $2.99 (240 Microsoft Points for Xbox 360) for the three-pack.
These tracks will be up on the Xbox Live Marketplace on Tuesday, and the PlayStation Network Store on Thursday.
All tracks are masters."