Hey there! It is possible that [i]Not Forgotten[/i] will stay, otherwise this too will get an alternative method to obtain this weapon.
[quote]Q. With the Forsaken campaign, Tangled Shore, and Dreaming City sticking around after Beyond Light’s launch, does that mean other Year 2 Seasonal content will remain playable in Year 4 too?
A. No. The Year 2 Seasonal content - including Forges, Reckoning, and Menagerie - will be entering the DCV on November 10. Be sure to experience that content and mark the final items off your collections and checklists before they are Vaulted. Here’s a cheat sheet of what to complete:
* Ada-1, Black Armory, and Season of the Forge quests.
* Gambit Prime, Reckoning, and Season of the Drifter quests.
* Benedict-66, Werner 99-40, Menagerie, and Season of Opulence quests.
* Pinnacle and pursuit weapon quests.
* Note: These weapons will receive an alternate acquisition method. More details to come later this Season.[/quote]
https://www.bungie.net/en/News/Article/49454