The Destiny grimoire has been updated with TDB cards, and there are three cards for Rasputin.
I know it's already been said we'd have to interact with "it" in some way.
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By "interact" you mean deploy ghost near it, defend 3 waves of enemies, then get a cryptic, non sensical line about something that doesn't matter anyway. Yup. Interact with it.
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The bunker in Forgotten Shores, RAs-2, it's a huge computer complex with an observation room. The numbers were a dead giveaway. I found it in the beta along with many others and figured it would be here where we found out more about it or interacted with it but definitely a strike/battle location in the huge central chamber. There is an alternate entrance/exit near the grotto where the hive is but over a cliff where a dead ghost is.
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Rasputin was a major part of the original stories The warmind on Mars was originally supposed to be activated by us after being sent there by rasputin