Here's what we know:
* No concrete plans for a sequel: Hobb has not announced any plans for a direct sequel to the Fitz and Fool trilogy. However, she has mentioned that she might revisit the characters in the future.
* Focus on other projects: Hobb is currently working on a new trilogy called "The Dragon's Path", which is set in a different world and features a new cast of characters.
* Open to possibilities: Hobb has stated that she might return to the Realm of the Elderlings, but only if the story feels right and she has something new to say.
Therefore, while it's impossible to predict with certainty, it's unlikely that Hobb will write a direct sequel to the Fitz and Fool trilogy in the immediate future. She seems interested in exploring new creative avenues, but the door is not closed on returning to the Realm of the Elderlings.
However, there is always a possibility that she might revisit the characters or their world in some form later on. It's best to stay tuned and await any official announcements from the author herself.