honestly they probably have a higher drop rate for exotics in their own studio the chances of one dropping from any chest is so low it's almost insulting to players whom farm I've opened over 4000 chests and none of them has so much as even produced a legendary engram all I get is material hadium flakes or an occasional blue engram or decrypted blue engram(s') it's f-king sad. I've lost all faith in these redundant hype trailers their epic bull shiftery(not getting in trouble for writing a curse word thanks) my word of advice is don't believe them don't put any faith in it this way "IF" something positive does occur in game you'll feel happier about it.
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I had a legendary engram last week from a chest have also seen a friend pull an exotic from a chest on Venus, it's possible just very very rare.
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If you are gonna farm chests, just run a circuit of the rocketyard.