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The Arena of Annihilation is a scenario in Mists of Pandaria pretty similar to "Ring of Blood" group quests from the previous expansions.
At our first scenario preview, when we tested out the A Bewing Storm scenario, we had also a few general thoughts about scenarios that are still valid.
The Arena of Annihilation looks like Trial of the Crusader raid instance and feels exactly like a Ring of Blood quest. It also has three stages, exactly like the scenario we tested before, but, maybe because is Beta, is pretty easy to complete.
We also made a video for the entire scenario. Tell us what do you think about it.