Destiny 2 announced that a new set of Trials of Osiris armor would be coming for the next season this morning. That it would become the next Season, or Season 13 came as a bit of a surprise, as most players anticipated it would instead drop the Season after, AKA Season 14.
With sunsetting being introduced to Destiny 2, players were told to expect loot to have a one-year lifespan before they were power capped. Trials of Osiris, Destiny's PVP endgame mode, was reintroduced to Destiny 2 last March in Season of the Worthy, so players expected Trials loot to get refreshed Season 14, which was supposed to launch this March. However, when Beyond Light was delayed to November, it messed up the current Destiny schedule. Season 14 is now expected to go live in May and Season 13 will go live Feb. 9. Thus, instead of releasing new Trials armor in May, they've decided to give it to players one month early instead.
There's a lot of speculation as to what next season will deal with, but the new Trials armor appears to have a Cabal-like feel to it, so perhaps it'll involve that faction. There have been rumors that a possible alliance with the Cabal may be coming, given by a screenshot from the Beyond Light Vidoc showing Zavala, an NPC who leads the Guardians, and the Cabal in what appears to be a meeting.
Destiny 2's Season of the Hunt will end Feb. 9 and a new season will take its place. Its name is currently unknown, but we do know it will introduce seasonal challenges. A trailer for the season has been confirmed to come on Feb. 2.