I personally don't see DK opening until 2026 at the earliest, even if they started construction like next week. It took them five years to build this and three years to build WWoHP. I just don't see them going warp speed on DK like that. Also Jim Hill has been wrong a lot of things.
But hey, if they can open DK at 2025, then great! USH will have two decent coasters in two years. I don't see the Mummy lasting long after DK.