In the original story the Exo Stranger was an assistant to Osiris. She might still be related to Osiris in some way. It would explain her abilities as well as her vested interest in the Vex.
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That would certainly be interesting, though it seems they may have switched her over to Praedyth rather than Osiris, especially with the way No Time To Explain came about. That being said, for a character as instrumental to our introduction of the Destiny world as she was, and with as much mystery steeped around her as they made, she deserves to be exited PROPERLY, not the way Bungie has done so already. I think that that should really mean IN game, but if they were to do it well enough in a comic/cartoon, not just a quick one-and-done, then that would probably be alright.