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Urobi the Walker can be found sitting under a small Pandaren structure on a tiny island in Shang's Valley.
Like other Pandaren his three abilities are Chi Burst, Healing Mists and Spinning Crane Kick. The most important thing to know when taking him (and other Pandaren rares) down is to interrupt Healing Mists, and run away from Spinning Crane Kick. Ranged players should also stand within 15 yards of him to avoid his Chi Burst which deals some pretty massive damage.
Urobi has a chance to drop the agility staff Pathwalker Greatstaff.
In order to find Krax'ik, you will actually need to check his spawn location. He stands stealthed at the top of a hill overlooking Serpent's Heart, and NPCScan will not pick him up unless your practically standing on top of him.
Sarnak has a chance to drop the only boe epic weapon from a rare in the zone, the Fishsticker Crossbow.
Kor'nas really only has a couple of abilities to be aware of. Those are Shadowbolt and Voidcloud. Shadowbolt deals a moderate amount of damage and can be interrupted. Voidcloud hurts, it appears as a dark purple area on the ground and is VERY easy to notice and move out of.
Kor'nas has a chance to drop a nice epic caster staff called the Darkstaff of Annihilation.
Ferdinand can spawn in several different places throughout the Arboretum. Generally he can be found sitting peacefully under a cherry blossom tree.
Ferdinand's abilities are: Bellowing Rage, Rushing Charge and Yaungol Stomp. Yaungol stomp does some heavy damage, but the range is small - so it's easy to move away from. Bellowing rage you need to be aware of. He deals a lot more damage when this buff is up, combined with Rushing Charge the results can be devastating. When he uses Bellowing Rage, he will be slowed though - so it is possible to just run out of striking range until the buff wears off.
Ferdinand is one of two rares in the zone that drops the 1 handed strength mace: the Ook-Breaker Mace.
Aethis can be found kneeling in front of what looks like a little shrine in the middle of a small pond just north of the road leading into Forest Heart.
Aethis has three abilities, they are: Rain Dance, Torrent and Water Bolt. The absolute most important thing you need to know when fighting him is to interrupt Torrent! If not interrupted, this spell will kill his main target. Rain dance hurts, but it is survivable. The rain droplets can be moved away from, this spell can also be interrupted (but I like to save my interrupts for Torrent because of cool-downs).
Aethis can drop a very nice epic caster mace called the Pool-Stirrer.
Mister Ferocious (Hozen)
Mister Ferocious spawns right next to the turned over cart with items strewn about it in the middle of Forest Heart.
Mister Ferocious' abilities are: Bananarang, Going Bananas and Toss Filth. Bananarang deals a hefty amount of damage, just move to the side to get out of it's path. Going Bananas is the ability he uses that can be the killer. He jumps around, and if he lands on you it'll knock out over half of your health in one shot. It's rather difficult to avoid this, be ready for some defensive cd's and/or heals.
Like Ferdinand, Mister Ferocious drops the 1 handed strength mace: the Ook-Breaker Mace.