Hey, been a lurker for a while on these forums, but I think I actually found something that may be worth adding to this site.
A friend and I were sitting around in Dragon Soul when the LFR (ToES) que popped. We finished the LFR, everyone but us left, and I finally death gated out. Then I hit "teleport into instance group" and found myself back in Dragon Soul, sitting atop Wyrmrest, with Thrall prompting me to start the Ultraxion event. I had already killed Ultraxion earlier, so I was a bit confused. So I started the event, did the gauntlet, and lo and behold, the LFR Ultraxion was up.
I'm not really sure if this is just a random occurrence that could never be replicated, or if whatever conditions I "met" allowed this bug to occur, but I am undeniably in level 85 LFR.
I'm not sure if this had already been found, but I couldn't find it anywhere, so I decided to post it. If it's already common knowledge, please feel free to remove this thread.