Look closely at the pics from the weekly update. Most of the pics show guardians standing in new areas of the tower. One of the pics totally shows a warlock standing in front of that door near the speaker where xur sometimes spawns at but......the door is open!!
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sorry to break that for you, its the PvP map of the "other" tower.. (dont even try to ask why "the city" has not repopulated this one.. )