Based on George RR Martin's Fire & Blood, the House of the Dragon season 2 finale was recently streamed & the stage is all set for 'Dance of the Dragon'.
HBO recently dropped A Knight of the Seven Kingdoms: The Hedge Knight's first look based on the Tales of Dunk and Egg stories.
Aegon's Conquest based on Aegon the Conqueror is also in development in terms of the GOT prequel.
The Golden Empire, a Game of Thrones spinoff has been in early development since January 2021 & it will revolve around the Westeros.
Although not confirmed there are reports that HBO is mulling The Sea Snake series based on Corlys Velaryon.
Corlys Velaryon is also seen in the House of the Dragon and is known as greatest sailor in the seven kingdoms.
10,000 Ships is a prequel pre-dating the Targaryen Conquest of Westeros and is in the works.
As per reports, the Game of Thrones spinoff prequel will be the story of Princess Nymeria of the Rhoyne.