TL;DR:

• Final Shape Delayed to June 4th 2024.
• Season of the Wish content will go from Tomorrow till February but the season will last till TFS launches. (6 Months)
• In February, weekly progression based quests called Wishes will launch.
• Moments of Triumph launches in February.
• Guardian Games moves up to March with an increased focus on class vs class.
• A new two month content drop called "Into the Light" launches in April. Free to all players.
• 3 new PVP maps drop in May.

Joe Blackburn also put out a video on Youtube talking about this with some more details: https://www.youtube.com/watch?v=eSJDyAIOk2c

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I don't see how they can do anything other than cosmetics and maybe refresh a weapon pool as craftable since they just found out about this last month.

Here's my guesses for what we might get:

• A new Moments of Triumph armor set tied to a set of objectives with a corresponding title.
• VoG or Garden gets craftable weapons+updated perks.
• Leviathan returns w/ craftable weapons (highly unlikely)
• Additional Campaign missions from Red War and/or Forsaken get put back in.
• A mini campaign taking place on existing locations gets added and built from leftover content/voicelines. (Kind of like Veil Containment)