Hunter's new ammos might drop from bosses or bought with emblems, nothing is decided for the moment
Hunter's mana is GONE!!!
Hunters now use focus, no longer care about intellect or mana regen.
Focus regenerates contunously, Steady shot improves the rate of getting focus bag.
Rogue energy comes back at a 10 / sec rate, Hunter focus comes back at 6/sec (12/sec with steady shot)
A shot costs 30 to 60 focus.
Hunters will have fewer cooldowns on abilities
Ammos will become an item, not a consumable.
Attack Power: We're removing Attack Power from items as well. Instead, we're allowing Agility to provide the necessary Attack Power for leather and mail wearers. Strength will provide the appropriate amount of Attack Power for plate wearers. This means leather and mail items will no longer be desirable for plate wearers.
Armor Penetration: This ability is too confusing and "mathy." It is being replaced with Mastery, a stat that makes you better at what you do. More on that later!
Armor Penetration is removed from the gear but not from the game. There are plans to reintroduce it in another way to allow players to kill plate wearers. (Armor Penetration talents, etc ...)
Haste: Will also increase the rate at which you gain energy, runes, and focus. Retribution paladins and Enhancement shaman will have a talent that allows them to take advantage of this benefit.
In Patch 3.3, pets will scale of all of your stats and allow buffs from raid encounters to affect them.
In Patch 3.3, there will be changes to make sure that pets can't be hit by AOEs from bosses but others (PvP) will be able to affect them.
Pets classes might get a "move to this location" command for their pet, long cooldown abilities that let your pet teleport to you to get out of trouble. This would be good feature since developers can't make pet AI as smart as a player.
Hunters might be able to choose the talent tree of their pet to let them pick the pet that looks best to them. Zhevra is a possibility for Cataclysm