The new information is that they're planning on taking those maps up a notch. Instead of just a stylized skull icon marking where the bosses are on the map, we'll be getting enhanced information about each boss encounter.
This will include a 3D portrait of the boss, a brief bit of lore about why exactly you're fighting them and a list of what all loot drops. While all that is all well and good, this is not where the new features end.
The interface will also give you a listing of what abilities each boss uses. That doesn't mean that you are given the strategy, but instead you'll be able to find out what things to look for during the encounter and react a little faster. You'll know if a debuff will be something that you must cleanse immediately or something that you'll be able to ignore for a moment while healing and then get to when you have a moment. These features will not only be for 5-man content, but will also be available in 10/25-man raids as well as heroic content.
Their reasoning behind this is two-fold. First, a lot of players already tab out to check sites like Wowhead to find out loot and boss abilities. Secondly, when presented with a new dungeon a player doesn't have to have as many things explained by the dungeon guide. We'll see how this develops when 4.1.0 starts to get closer.
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