Whilst The Elder Scrolls V: Skyrim has been remastered for more platforms than you can shake a stick at, its 2006 forebear has gotten much less official love. However, Oblivion has been getting a major makeover thanks to a large collection of modders and fans who took it upon themselves to remake the entire game in Skyrim's engine, whilst also upgrading that engine considerably.
The result, the slightly-painfully-named Skyblivion (I would give Bethesda serious money if they give them permission to just call it "Oblivion Remade" or something), has been making serious progress for the last couple of years, with increasingly impressive dev diaries and YouTube videos exploring the rebuilt version of Tamriel's Imperial Province of Cyrodiil.
The team have now confirmed a 2025 release date. If that seems a bit far off given how much progress they've made recently, the team agrees and notes this is a worst-case scenario date and they don't get any more resources to help bring the game across the finish line. However, if they are able to recruit more people to help out, they might be able to shave some months off that and bring the game out in 2024 instead.
Skyblivion has ported the entirety of Oblivion into the upgraded engine, but the team have gone back and recreated almost all of the textures, models and effects in the game. Some of the geographic areas have been reworked and resized to make a bit more sense, and the city of Leyawiin has been almost completely redesigned in line with its original, more ambitious, concept art. The biggest change will be with the dungeons. Oblivion used very repetitive and simple dungeon designs, with even some dungeons being simple copy+pastes of others. Every dungeon in Skyblivion has been redesigned and many are now larger and more sprawling. The game will also use Skyrim's more balanced level-scaling system rather than Oblivion's deranged version, but will retain the original game's spellcrafting mechanics.
Skyblivion will launch by 2025 at the latest, and will require the player to have purchased copies of both Skyrim and Oblivion. Bethesda themselves are working on their brand new, space-based roleplaying game, Starfield, which should be out later this year. Bethesda are also in pre-production on The Elder Scrolls VI, but that is many years away.