According to @westerosorg on X/Twitter, Martin revealed that there are seven Game of Thrones projects in various stages of development. Among these, four are animated, and three are live-action. Although specific details about these projects remain under wraps, hints have surfaced regarding their potential storylines.
Several projects have already been mentioned in the past. One is Ten Thousand Ships, focusing on the Rhoynar's landing in Dorne. Another anticipated project revolves around Aegon the Conqueror, the first Targaryen king. There is also talk of a series set in the Golden Empire of Yi Ti and a story centered on Corlys Velaryon and his legendary voyages, as mentioned in the report by Movieweb.
Previously, it appeared that some planned projects had been shelved. However, the success of House of the Dragon seems to have reignited interest, bringing some of these spin-offs back to life.
Interestingly, Martin did not include House of the Dragon in his list, possibly because the show is already well-established with two seasons. While Martin has praised the second season, particularly for its spectacular dragon battles, he has also expressed dissatisfaction with some of the adaptational changes.
It's unclear if A Knight of the Seven Kingdoms is included in Martin's count of seven spin-offs. This series, set to debut next year and currently filming, follows Ser Duncan the Tall and his squire, young Aegon