The Ampere RTX series is almost here and water blocks will be "ready at or close to launch", according to one water block supplier. Additionally, a picture of the die for the GeForce RTX 3090 has leaked, detailing that NVIDIA is readying the GA102-300-A1 for release.
https://www.notebookcheck.net/Possible-NVIDIA-GeForce-RTX-3090-die-leaks-as-supplier-confirms-that-Ampere-water-blocks-will-be-ready-at-or-close-to-launch.489604.0.html