It seems that the PlayStation Plus Essential games for January 2023 have been leaked before an official announcement. Signs are now pointing to Star Wars Jedi: Fallen Order, Fallout 76, and Axiom Verge 2 being free to grab in the first month of 2023.
This comes from Dealabs user billbil-kun and was reported on by VGC. The leaker has accurately predicted PlayStation Plus Essential's free games line-up since September 2021, and so it seems that these titles very well could be getting the ultimate discount soon.
Star Wars Jedi: Fallen Order would be a great pickup for anyone who hasn't yet dived into the 2019 Soulslike. With Star Wars Jedi: Survivor coming out in March too, now would be a great time to play through it.
Fallout 76 is also most likely worth the download for fans of Bethesda's post-apocalyptic franchise, as though its horrible launch is still remembered by many, it has improved a lot since then, earning millions of players.
Axiom Verge 2 is a Metroidvania title which only dropped on PS5 in August 2022. It leaves the player in control of a mysterious billionaire who finds themselves on a mysterious, hostile world.