Caribald posted videos that show two mini-bosses in Wyrmrest Temple being soloed: General Zarithrian in the Ruby Sanctum and Shadron in the Obsidian Sanctum.
World First Hunter Solo: Caribald vs. General Zarithrian
Caribald: Really hard for a mini-boss. I don’t know if any hunter soloed him before me, but I’m pretty sure I’m first.
He stacks a debuff that removes 20% of target’s armor, stacking 5 times. It becomes un-healable, but luckily he’s not immune to Distracting Shot, nor does it go on diminishing returns. His Intimidating Roar makes things more interesting though, along with adds :) Adds are CC-able though, so it’s just about executing it properly to get him down.
Hunter solo: Caribald vs. Shadron
Caribald: Not the first time I do this, but if I’m not mistaken some people think Shadron isn’t soloable for hunters. Well, she is :) Shamans can do it with Earth Elemental staying outside, but hunter pets work differently and go in with you.
The tactic here is to just burst her down before she even spawns the add by using every cooldown.
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For more information and videos about soloing in Wyrmrest Temple and other Wrath of the Lick King raids see our WHH compilation: Hunter Soloing Guides: Wrath of the Lich King.