"Gambit and Gambit Prime are being merged into a single mode, with their original armor visuals available to earn from the Drifter."
What does it mean "original armor visuals"? Is that all of the Gambit Prime sets? Will Reckoning still reward those sets? Are those sets usable in a meaningful way for the new Gambit? Will the Drifter still have his allegiance mission, and Invitation to the Nine? I think those quests require clarification, as it isn't listed in the content going into the DCV.
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Bungie hasn't given clarification on all the points you listed. Best to wait until right before the expansion. We'll likely get the full details then.