This custom-design card features a 1590MHz GPU Boost and 945MHz HBM2. The GPU overclock is just a bit above the 1546MHz offered by the reference card, and far below the 1677MHz offered by AMD's Liquid Edition. If the pricing is accurate, the value proposition here seems to be pretty poor.
The ROG STRIX RX Vega 56 will have a 1590MHz Boost and 800MHz HBM2. This compares to a 1471MHz Boost on the reference card. We don't know the pricing of the STRIX RX Vega 56 but 599EUR is probably a good bet.