According to detail provided by ASRock, this custom RX 6900 XT uses higher-end components like a 21-phase VRM with 90A Power Chokes, Nichicon 12K Black Capacitors, a 2oz Copper PCB, and a pre-binned RX 6900 XT GPU, which is probably the same Navi 21 XTXH GPU spotted with Powercolor's RX 6900 XT Red Devil Ultimate graphics card.
The card also uses a custom triple-fan cooling system with an all-metal cover and Striped Axial Fan, which should enhance airflow and minimize noise, as well as the ARGB LED with Polychrome SYNC support.
Specification-wise, you are looking at an RX 6900 XT with 16GB GDDR6 memory on a 256-bit memory interface, as well as higher Game and Boost clocks, hitting up to 2295MHz and 2475MHz when running the Performance BIOS.
Unfortunately, ASRock did not reveal any details regarding the price or the availability date, but hopefully, these will start appearing on retail/e-tail listings, if scalpers and miners do not pick them up.