Some Trading Post challenges reference Love is in the Air activities, plus a new Lunar Festival achievement references the Dragon Isles. This leads us to speculate that Patch 10.0.5 will be live by mid-January 2023, with the first monthly Trading Post starting in February 2023.
Since 10.0.5 is not a large content patch, mainly featuring the Trading Post, Class Tuning, and transmog updates that have been in the works since beta, it makes sense that the patch could be so soon.