we already had this discussion and checked sources like 10 times on the forum.they add the option to see exact number on friendly units like party members and such ,not on enemy unit.exact value on enemy unit come with WOTLK or pre wrath pacth.
http://wowwiki.wikia.com/wiki/Patch_2.3.0
There are now options for displaying health and mana values on your health/mana bars for you/your party/your target and to display that information either as percentages or as numbers.
http://wowwiki.wikia.com/wiki/Patch_2.3.0
There are now options for displaying health and mana values on your health/mana bars for you/your party/your target and to display that information either as percentages or as numbers.
Bottom of patch notes, User Interface
as i said its only for friendly targets.we had this discussion and check this patch notes like 10 times already at the forum you can simple use search option at the forum to find tons of post about this.
I remember in TBC I was a tank and always comparing my own HP with others hanging around in Shattrath so I'm pretty sure you could view others HP, unless I had some other addon way back then, but unfriendlies I do remember it not showing.