There have been some clues in the literature published to date about the continuation of the plot threads seemingly left unconcluded after The Soul Key, especially George's novels.
We know that the Ascendants eventually came to Idran and Bajor. We can guess at the outcome: Bajor still thrives, the Typhon Pact is barred from visiting the planets of the Idran system, and Raiq is a monk at Kira's monastery. Taran'atar seems to have played a major role, with mention in Plagues of Night of a final action that "changed everything".
We also know that something terrible happened on Bajor's moon Endalla, something that posed a significant threat to local space and was cited by in Plagues of Night as one of the preoccupations that kept Bajor and the Federation from heading into the Gamma Quadrant. Sisko and Vaughn each played a major role in managing the crisis.
What else?
We know that the Ascendants eventually came to Idran and Bajor. We can guess at the outcome: Bajor still thrives, the Typhon Pact is barred from visiting the planets of the Idran system, and Raiq is a monk at Kira's monastery. Taran'atar seems to have played a major role, with mention in Plagues of Night of a final action that "changed everything".
We also know that something terrible happened on Bajor's moon Endalla, something that posed a significant threat to local space and was cited by in Plagues of Night as one of the preoccupations that kept Bajor and the Federation from heading into the Gamma Quadrant. Sisko and Vaughn each played a major role in managing the crisis.
What else?