The Iron Banner playlist will be on the lower tile in the middle. There is a new blanked out tile above that.
It was there when the DLC came out I believe. It's between the tiles for the DLC playlists and in the middle, looks kinda like a sun, or maybe an eye...
http://www.destinydb.com/items/4136763184-eye-of-osiris
We've heard nothing about the Trials of Osiris. Anyone out there getting tournament tickets???
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They will also be introducing "inferno" mode, which is no radar and no abilities. I'm not sure if that means no supers, or none of the class specific abilities, such as melee and grenades.