Mists of Pandaria patch 5.1 “Landfall”, is now live on all realms. The new patch is packed with updates including item level upgrades, Brawler’s Guild, Pet battle updates, new scenarios, class changes and much more.
Here is a quick rundown of what to expect: 
Brawler’s Guild:
- Entry into the brawler’s guild is by invitation only. Invitations can be found on the black market auction house, by invitation from somebody within the guild, and occasionally as drops from certain Horde and Alliance NPCs.
- You will be able to fight challenging bosses one-on-one in fighting rings for special achievements and awesome looking gear.
Two New Factions:
- You can obtain special rewards and mounts with the two new factions introduced in 5.1, Operation: Shieldwall (Alliance) and Dominance Offensive (Horde).
All New Scenarios:
- Krasarang Wilds and A Little Patience (Alliance)
- Dagger in the Dark and Domination Point (Horde)
Pet Battles:
- New Wild Pets to Capture
- A more polished Pet Battle UI
- New Pet Tamer with Daily Quests
- A new item has been introduced that can be used to upgrade the quality of Battle Pets: Battle-stones.
Bug Fixes (Complete List)
- The effect of PvP Power on healing will now appear correctly on the Character Sheet.
- Swooping Plainshawks no longer use abilities from the Bird of Prey Hunter pet family.
- Fixed an issue that could cause crops to fail to appear when players entered Sunsong Ranch while several hundred yards up in the air.
- Players who have learned the Terrible Turnip pet can now continue to find Ominous Seeds when harvesting Cooking Ingredient crops.
- Classes
- The responsiveness of many abilities and effects has been improved, including: Renewing Mist, Halo, Rogue Poisons, Revealing Strike, Rime, Killing Machine, Maelstrom Weapon, Sudden Doom, Ultimatum, Scent of Blood, Crimson Scourge, and Sudden Death.
- The following spells now display less intense visual effects for other players: Hellfire, Death and Decay, Hurricane, Astral Storm, and Explosive Trap.
- Earthquake’s sound effect is now quieter.
- All spells that cause Forebearance can no longer be applied simultaneously.
- Hunters
- The snare provided by Ice Trap is now more responsive when enemies enter or leave the area of effect, and its effective area more closely matches the visual effect.
- Lock and Load will now activate correctly when Ice Trap is triggered by an immune target, as long as a susceptible target is within the area of effect.
- Fixed several issues involving Trap Mastery, Entrapment, Glyph of Black ice, and Glyph of Ice Trap.
- The Growl pet ability will no longer cause diminishing returns against bosses that are immune to its effect.
- Glyph of Black Ice now correctly benefits from the increased duration provided by Trap Mastery.
- Glyph of Ice Trap now causes the visual effect of Ice Trap to match the increased area of effect provided by the glyph.
- Mages
- Fixed an issue with Glyph of Icy Veins that could prevent all three bolts from firing.
- Fixed an issue with Glyph of Icy Veins that could prevent the affected abilities from doing the correct damage.
- Warlocks
- The Felguard and Wrathguard pet ability, Threatening Presence, will no longer be auto-cast by default.
- Pandemic no longer smooths the damage when extending dots with different amounts of spellpower.
- Warriors
- Execute damage with high amounts of Vengeance is now capped at the Warrior’s maximum health to prevent it from reaching excessive numbers.
- Professions
- Banquet of the Steamer and Great Banquet of the Steamer now correctly provide Intellect to damage based casting classes. Healers will continue to gain Spirit from these foods.
For complete patch notes please visit Blizzard’s official post.
