https://wccftech.com/amd-radeon-rx-6600-and-rx-6600xt-gpus-listed-in-new-update-launch-imminent/

Via the website Videocardz, well-known informant @KOMACHI_ENSAKA on Twitter has leaked details about the recent driver releases by AMD pointing towards the possible future launch of the Radeon RX 6600 GPU and RX 6600XT GPU, complete with the Navi 23 GPU. AMD currently uses the Navi 23 in their Radeon RX 6600M mobile GPU. Both GPUs listed in the driver update correspond with the "73FF" PC Device ID as shown below.

Earlier this year at CES 2021, AMD informed their audience that they would be releasing a graphics card sporting a single-fan setup in the future. With this new leak, it looks like they were talking about  the Radeon 6600 GPU and 6600XT GPU - each housing a Navi 23 GPU. Based on the driver update entries and the hints from AMD, it is likely that we are looking at a simaltenous launch of the two graphics cards.