SabrePC has Frontier Liquid listed at 1490 USD. The card is currently in stock, which means it will ship to any customer in less than 24 hours. That said, we can expect the first hands-on review very soon.
Spec-wise Vega Frontier Liquid is essentially the same as an air-cooled edition. The only difference is the typical board power of 375W (+75W). This is likely to provide higher clock speed, closer to advertised peak clock of 1600 MHz.
Vega Frontier Liquid might be a good indicator of what RX Vega XTX might offer (which is also rumored to be a liquid-cooled card).
Of course feel free to share pics and performance benchmarks if you happen to buy one.