I think daily heroics and nightfalls have something more to offer us. This weeks nightfall had what looks to be like a breakable vent in one of the rooms and behind the vent was like a fully fledged out room with lights in it and objects. You cant see this room without peeking through the vent itself. It might have something to do with armsday :P you never know.
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Where is this vent, in what room?
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near the end of the strike, not the final room but in the area before you kill those enemies coming up ahead.
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not the vents which have the fragment in them either.