On the Timeless Isle, when a rare spawns an icon appears on your minimap. This triggers a new event which addons can listen for, which means that RareAlert can tell you when this happens. So, keep looking at those elites in front of you instead of staring at your minimap! RareAlert will display a message and play a sound for you. Additionally, it seems that this addon also works for other places in Pandaria as well.
Unglue your eyes from the minimap and get this addon here.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh