Staff of the Hidden Master

This pretty staff is found in the bamboo forest in Western Valley of the Four Winds, where the Hidden Master himself resides.

Staff of the Hidden Master

As with the other lootable treasures, make sure you're not attacked, and keep an empty bag slot, and finally, don't move while you loot it! You can see it once per character, once it has been looted, successfully or not, it will despawn. However, you can loot it again on other characters, so you can have more than one in your possession.

For TomTom users, the coordinates are as follows:

/way Valley of the Four Winds 15.4 29.1 Staff of the Hidden Master
/way Valley of the Four Winds 17.5 35.7 Staff of the Hidden Master
/way Valley of the Four Winds 19.1 37.9 Staff of the Hidden Master
/way Valley of the Four Winds 15.0 33.7 Staff of the Hidden Master
/way Valley of the Four Winds 19.0 42.5 Staff of the Hidden Master

Container:  Staff of the Hidden Master
Looted item: Staff of the Hidden Master

Ghostly Pandaren Craftsman

This ghost spawns next to one of several trees just East of the Heartland in the Valley of Four Winds. You have to interact with him, and make sure that you have one slot of bag space. He will give you the rather useless Ancient Pandaren Woodcutter after a short conversation. Once someone has spoken to him, he will despawn, so only one person can get the charm at a time. Moreover, there are some rampaging virmen in the area, make sure that you clear the area surrounding the craftsman before talking to him, as he may despawn when you get attacked during interaction.

 As he is an npc, you can add him into NPCscan, his ID is: 64191.

Ghostly Pandaren Fisherman

This ghost spawns on the shore of Cattail Lake in the Valley of Four Winds. You have to interact with him, and make sure that you have one slot of bag space. He will give you the Ancient Pandaren Fishing Charm after a short conversation. Once someone has spoken to him, he will despawn, so only one person can get the charm at a time.

Ancient Pandaren Fisherman

As he is an npc, you can add him into NPCscan: his ID is 64004.

Patrannache

Patrannache

Patrannache, the presumed mate of Mazzranache (pink strider, Mulgore, remember?) took me days to find!
Not only are his tracks tiny and even invisible in sections of his path, but he roams around the entire zone! But with help of Quivering's map, I was able to track him down, flare him up and follow him from Half Hill to the eastern start of his path. I have mapped that stretch, and have completed the other half with Quiver's map, as it takes him a very long time to go from A to B.

You don't have to follow the tracks backwards anymore!

Leaves: Barely-Visible Tracks
Level 86

Map

And another of Kalliope's fantastic informative videos, featuring this flamboyant bird:

Salyin Warscout

Salyin Warscout

Salyin spawns on the riverbank southeast to the Silken Fields.

Race: Saurok

Drops: Phough-Driving Grips, Salyin Battle Banner

Bonobos

Bonobos

 Bonobos is found in the Paoquan Hollow in north-western Valley of the Four Winds.

Race: Hozen

Drops: Mudmug's Mitts, Magic Banana

Watch your step!

Nal'lak the Ripper

Nal'lak the Ripper

 

Nal'lak patrols the Sha-infested area near the big wall in western Valley of the Four Winds.

Race: Mantid

Drops: Dynasty of Steel, Plough-Driving Grips

Dynasty of Steel activated

Sele'na

Sele'na

Sele'na is found in the in the Gilded Fan Marsh, in the Valley of the Four Winds. It drops an interesting trinket that I haven't had a chance to test yet as 1. It's not for druids and 2. It only works till lvl 94.

Race: Jinyu

Drops: Grain Warden's Gauntlets, Overgrown Lilypad

Jonn-Dar

Jonn-Dar

Jonn-Dar is a stone sculpture found at the ruins north of Nesingwary's Safari in the western Valley of the Four Winds. Once engaged, he turns into flesh and attacks with the usual mogu spells.

Race: Mogu warrior

Drops: Mudmug's Mitts, Terracotta Fragment

Terracotta Fragment

The Terracotta Fragment summons a Terracotta Warrior to help you in battle.

Sulik'shor

Sulik'shor

Sulik'shor is found at the outside of the Caverns of Endless Echoes, north of Cattail Lake.

Race: Mogu sorceror

Drops: Crystal of Insanity, Gloves of Congealed Mist

Nasra Spothide

Nasra Spothide

Nasra resides under a pagoda on the bridge from Jade Forest to Valley of the Four Winds, in the east.

Race: Pandaren

Drops: Seed of Tranquil Growth

Tranquil Sprout

Blackhoof

Blackhoof

Blackhoof is seen skinning a dead Mushan in the field north of the bridge in front of Stormstout Brewery in the Valley of the Four Winds.

Race: Yaungol

Drop: Battle Horn

Galleon: rare elite

When I heard Chief Saliys yell "Loot and Pillage, bwahahaha'" across the Valley of the Four Winds, I thought I'd check if he and Galleon have turned to rare elites too, just like the Sha of Anger and indeed they did!
Sadly, that's all I can find out for now, noone is taking these guys on, and we still don't know if a loottable was added or not.

Humm... I did throw a moonfire at him to see if Saliys would get targettable to see his nameplate, but he despawned when I shadowmelded. People were not happy with me :)

However, Aeonaxx in Deepholm also despawns when you fight him and drop aggro. If this carries on to live, we won't get to see much of these world rares if every passing hunter or nightelf just attacks, feigns death, shadowmelds and rare goes poof!
Nevermind, while I typed this post, he respawned again!