Select PC builders are mentioning the availability of the RX 6900 XT Liquid Cooled, but none of them specify the actual costs, so they might charge some ridiculous prices for around 10% performance uplift coming from overcharged specs such as boost clocks of up to 2435 MHz, 18 Gbps GDDR6 RAM and TPB bumped to 330 W.
https://www.notebookcheck.net/AMD-doing-Nvidia-things-Radeon-RX-6900-XT-Liquid-Cooled-edition-with-faster-core-clocks-and-VRAM-quietly-introduced-only-for-select-custom-PC-builders.545934.0.html