Its been covered here in the forums a number of times. General consensus is that it would not be what most want, or would expect from playing the class in earlier entries of the franchise.

Long story short, we are limited by the skill system and no class can have more or less skills than another class to a large degree. Therefore, you will not be "learning" any monster skills in any kind of pertinent content during combat, as it would not fit into the current game structure. You would have class quests with lore where you "learn" a predetermined skill set (like any other class) but in the end, your just another melee or magic DPS with a specific, set rotation for acceptable DPS output.

Don't count on going out in the field and learning a ton of abilities and selecting which ones you want to use in the raid later that evening.