Have you read the Ana Bray stuff from 'No Time to Explain'? Get the feeling that will tie into the Cabal arc and the forthcoming Mars social zone. Clovis are almost certainly responsible for developing the human -> Exo conversion process... The big question is why the Exo Stranger is pushing us to investigate it ourselves. What's she trying to tell us? I'd put money on it that you could pull history out of an Exo mind post-wipe if you tried. Perhaps that's her angle? Imagine how much would change if the Vanguard knew it was Rasputin that blew up the Traveller, and not the Darkness?

Everything beyond them launching their copies into the Vex network is TTK grimoire. A lot of people haven't bothered collecting all that yet.