The Link above is to Destiny DB. With the most recent patch they managed to Data Mine a new mode called "The Arena"
It has 3 different difficulty levels; 29, 32, and 34. The Party size is 1 to 6, and it is listed as a Raid Activity, also being placed inside The Reef.
Now i would LOVE a Arena/Horde Style Mode, so hopefully it is what the title says it is, but there is also the possibility that this is the Raid For House of Wolves, because we don't have that much info on it, and we know the raid for The Dark Below is called Crota's End.
So Bungie...We know...its out there in the Wild. Are we getting a Horde Mode? Yes or No?
Do You think it is a Horde Mode, or a new Raid?
-
It's the name of Reef raid from "House of Wolves".