Bottom of the 4.2 patch notes:
User Interface
- The User Interface panels have been resized so there is no more need for scroll bars.The
- Addons will no longer be able to intelligently swap items by working with the built-in Equipment Manager.
- Character talent specializations can now be viewed on mouseover of the Battlegrounds Scoreboard.
- There is now a Dismiss Pet option on unit frames.
- The durability character display will now show items as yellow when they are below 20% durability, instead of when items have 5 durability or less.
- The Macros window and Spellbook can now both be open at the same time to allow for more intuitive macro creation. In addition, the Macros window has a Save/Cancel button.
- It is now easier to change the language of the game client to any language available in the region.
- A target or focus target can be selected within the mini-map tracking (does not include enemy players).
- Vendors now display currency types they use.
What exactly is the functionality of this? At first glance I thought it may have been a return to use of mini-map for targeted spells like blizzard etc. but realise now it is actually targetting a specific unit which doesn't help for these AoE type spells. Is it only useful for hunters/druids who have some sort of tracking capabilities then I wonder?