The second PVP season of WOW Classic TBC has officially ended, and now players will focus on the next season. Blizzard hasn't officially announced a specific date for the next season by then, but there's some information that should give us a rough idea of what the next season will look like. MMOWTS lists the relevant info.
The TBC Classic now has 2 arena seasons, the first started on June 16th and ended on September 7th. The second one started a week later on September 14 and ended on January 10.
In an official post on the Blizzard Forums, they stated that the content for Season 3 and Phase 3 of Classic TBC will be available later in early 2022. Because of the PVP reward system, Blizzard is trying to ensure that the release of Season 3 is consistent with tier 6 raid content.
Blizzard kept saying during the TBC Classic that they didn't want to follow the release patterns that TBC originally released in the mid-2000s. They are more interested in making sure that tier 6 raid content is prepared before moving forward. While Blizzard also didn't set any specific date for the new phase, testing for raids in that phase began in early December.
Considering the patterns Blizzard has followed in the past, we can expect the game to move into Phase 3 in the next 2 weeks or so, with a new PVP Arena season.
In order not to disappoint fans, Blizzard often says that the game will be released soon. There is usually only a week or two notice of the definitive dates, so after that, you can always come to MMOWTS to check for the latest news. Or feel free to come here and buy TBC Classic Gold, which will help you get started Season 3 better.