Wow, rare spawn #3. I speculated about this one in another thread, but I got the zone wrong:
Wandering the Twilight Highlands is a rare spawn level 85 lion called Sambas. He uses the new lion model that the Alliance guild mount and several lions in Uldum use (which is why I thought they might place a tameable one in Uldum). He's very pretty, even though it does look like he just had a perm

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The location I found him on the map is here (basically due east of the Horde outpost called The Gullet):

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UPDATE: found him at another spawn point, this time in the north-east of TH:

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I also found him just before I ran into Karoma (new rare spirit beast wolf), so they don't share a spawn timer.