If we count the DJD's reveal in the beginning of this arc (debatable, I know), we've had a surprise character reveal in each issue so far. Wonder if the trend will continue

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I think that the Titans Return stuff should fit in well - hopefully it'll take the form of a "break" between the Dying of the Light arc and the eventual return to the Lost Light, the delay making the return to the LL more dramatic.
That said, I think their eventual return has been fairly clearly telegraphed - the prior few issues put a surprising amount of ink into establishing that they had a subspace window thing that people on Cybertron/Luna 1 could use to mail packages to the LL. Rodimus squeezing through an interstellar mailbox to take the ship back sounds like an incredibly MTMTE thing to do.
I don't think the organics are a lead-in to power/god-masters - remember, these organics are of a similar height to TFs (hence their pods being too big to fit through the "Quantum door").