Sadly no 1989 Batman Soundtrack DLC. The iconic Batmobile races into Batman: Arkham Knight in the form of a August DLC pack.
The 1989 Movie Batmobile Pack will contain the original costume and Batmobile skin for the 1989 Batman feature film. Also coming next month is the Bat-family Skin Pack which includes:
One Year Later Robin
Arkham Origins Batman
Iconic Grey & Black Batman
Original Arkham Nightwing
Season Pass owners for Batman: Arkham Knight should expect to see the Batmobile and Bat-family Skin packs next month on PC, Xbox One and PS4. No word yet on these DLC packs will be available for non season-pass owners.