This will be a new 2, 3, and 5-man arena available sometime after the next content patch. Blizzard has taken what they learned from the previous two arenas and tried some new things in the new map. Attempting to cut down on the geometry features and line-of-sight breaking objects was a goal in this arena. While there are still a few hiding spots, they tend to be in the middle of the map.
Another option that Blizzard is thinking about implementing is the ability to choose which arena map you play on. The downside, however, is that by doing so you are limiting the number of people in the queues by splitting them up into smaller specific queues.
While I've never been a big PVP buff, I'm sure that those of our readers that are will be excited to have another new arena map to play!
You can read the article here.