Although it was originally planned to be released together with the Radeon RX 6600 XT, the non-XT version was pushed back and judging from these listings, it will be coming to retail/e-tail shelves on October 13th, the same day when reviews are scheduled to go live.
The card in question, spotted by Videocardz.com, comes from Sapphire and it is a part of Sapphire's Pulse series. The card is listed at €590 and appears to use a custom PCB with single 8-pin PCIe power connector. It also uses a shorted cooler with two fans, at least compared to the Sapphire Radeon RX 6600 XT Pulse.
Unfortunately, the retailer/e-tailer did not list any specific details, other than the fact it is powered by Navi 23 XL GPU with 28 Compute Units (CUs) or 1792 Stream Processors.
Sapphire's Pulse series usually does not come with a high factory-overclock, and at €590, it ends up around €60 cheaper than Sapphire's Radeon RX 6600 XT Pulse. Currently, Radeon RX 6600 XT sells anywhere from €599 to €699.