The upcoming content for World of Warcraft patch 7.2.5 will include a Timewalking version of the fondly remembered Black Temple raid dungeon. Along with this new version of the raid being added, the patch will focus on some smaller class changes plus some new holidays being added as well.
The patch will also bring Chromie back, returning for a quest known as “The Deaths of Chrome.” D=etails are sparse about what the scenario involves right now, though.
The planned class changes revolve around Destruction Warlock, Subtlety and Outlaw Rogues, and Havoc Demon Hunters among others.
A full list of the changes can be found on MMO Champion from the PTR build 23910.