The Elder Scrolls 4: Oblivion Remastered is out right now, and yes, there's horse armor DLC

The Elder Scrolls 4: Oblivion has been remastered by Bethesda Softworks in collaboration with Virtuos, offering a modern update with 4K graphics at 60 FPS using Unreal Engine 5. The remaster includes all expansions and extra content like horse armor DLC, plus a deluxe edition with additional gear. It's available on PC, Xbox Series X/S, PS5, and is included in Game Pass. Bethesda emphasized preserving the game's essence while enhancing visuals and gameplay for today's systems.