Look at this curious thing.

[Arucado]

https://www.youtube.com/watch?v=RGBnjELkgok

0:19.

He shows Obsidian Edged blade, but it looks like the sword that drops Wyrmthalak

[avanyah]

Yeah several items had stock standard models much like old t2. Updated in patch 1.9, see:

http://wowwiki.wikia.com/wiki/Patch_1.9.0

"The following weapons and shields have been updated with new art : Perdition's Blade, Obsidian Edged Blade, Gutgore Ripper, Core Hound Tooth, Aurastone Hammer, Drillborer Disk, Staff of Dominance."

If memory serves, the old staff of dominance shared the same model as the staff of jordan, forgot the rest however.