They were in contact with each other on the subject of Oryx's coming, but that was before the Battle of Saturn. If Mara is still alive somehow, as I believe she is, they could still be in contact
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Eris talks about the guardian being the key? What is she referring to?
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Not sure. Whatever they were/are planning, it's something big. The Cult of Osiris is where your true loyalties should lie
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I'm guessing that it has something to do with the Nine and probably with the Cabal Emperor. We've seen a lot more of them in this DLC and based on his order to take out Oryx, I'm guessing it won't be long before he gets thrown into the mix.