This is quite a surprise for fanswho expected the game to arrive sometime in WOTLK Gold 2023. This is due to the release timing for past expansions, the possibility of a prequel novel, and the fact that an alpha version of Dragonflight isn't available to test on the game's test environment. When Blizzard revealed the new expansion back in April, the company didn't include the date, or even provide a release window for Dragonflight, with WoW game director Ion Hazzikostas stating Blizzard was opting for a "when it's available" strategy for the expansion's launch.
When Dragonflight comes out on the horizon, it's expected to bring big changes to WoW and include major overhauls of the game's class talent and profession systems as well as a new world to discover. Additionally, it will introduce the possibility of a new race to play which, for the first time in the MMO's time--will only be a single class, namely the new Invoker with a focus on spellcasting.
Dragonflight will have plenty to prove following the game's unsatisfactory Shadowlands expansion, however Blizzard appears to be learning some important lessons. Blizzard recently introduced cross-faction groups to WoW for content such as dungeons and raids for the first time. In addition, they've been working on incorporating more feedback from players by establishing the focus on the player WoW Community Council.
Dragonflight will be the initial WoW expansion to release since various investigations and lawsuits have revealed an buy WOW WOTLK Classic Gold apparent "frat boy" workplace culture of Activision Blizzard, which prompted the WoW development team to alter older game WoW content that could have been viewed as problematic. Activision Blizzard is currently in the process of getting acquired by Microsoft in the $69 billion deal.