"Haven't I already got the Diamond District album?" Yes and no. You have the clean edits - the full version of In The Ruff is due for its official release in 5 days time with two extra songs and the instrumentals. Why would you buy that? Because you can't listen to clean versions of I Mean Business and Streets Won't Let Me Chill. It's inappropriate.
To whet your appetite here's the new single Diamond District - Hologram