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This is a summarization of all current Destiny 2: Lightfall leaks compiled by Xenomarvel. I could be wrong on some of these, and it may not represent ALL leaked information. Post Tenebras Lux

Story Leaks:

The Traveler is gone (unknown location), which leaves Earth open to assault.

Poukas come from Neomuna, and act as a sort of field therapist. It is also able to see through Elsie’s time loops?

The Shadow Legion attacks the Last City. Sometime during Lightfall, the Worm Gods also attack the City, but these seem to be at different moments and not a coordinated attack

We hitch a ride onboard a Cabal cruiser, and discover Neomuna.
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Neomuna holds an artifact relating to the Traveler called “the Veil”, which the Witness requires to achieve the Final Shape.

The Cloudstriders are tasked with protecting the Veil.

The Witness somehow obtains the Veil and causes a Pyramid and the Traveler to collide, creating a portal (which will be referred to as the Schism for later purposes, but it has no official name that is known) to an unknown location (could be similar looking to the Corridors of Time based off of concept art).

There are mentions of a “Harmony Cloak/” or a “Harmony Cloaked object” which is put over the Traveler and “Veil Key” which causes the collision and Schism to form, but it's unknown the larger role they play.

The Schism is probably a new dimension, and could be the Final Shape.
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Season 20: Lance Reddick had trouble reading some lines for Zavala.

Season 21: Someone else dies.

Gameplay Leaks:

Strand Sidearm (Final Warning) is the S20 pass exotic (unknown if there are more).

The raid apparently has time traveling mechanics, where we jump to the Collapse and back into present time.
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Psychedelic theme for the raid.

Raid takes place inside the Schism/Traveler

Nezarec, Disciple of the Witness, is the raid boss.

One Lightfall season may not have a Power increase.

Strike rework sometime in Y6
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