If you were afraid that Destiny's old raids would be rendered obsolete with the coming of House of Wolves, fear not. The raids currently in the game will be updated to drop the new exotic gear being added wiht the DLC. This includes all drop locations (Gorgon's Chest) in a raid not just the final boss, not to mention the chance of receiving them in Nightfall strikes as well. 

The latest DLC becomes available on Tuesday, May 19th.