Pre-release City of Dragons (spoilers Farseer, LST, TM and RWC)

['thul]

many years have passed between Tawny man and the Rain Wild chronicles. The Tawny man and Prilkop were both heading south to Clerres within months of the end of Tawny man.
FitzChivarly is, as you said, unlikely to leave Withywoods. He is fairly old by now, and rather content with his life. However, someone else from the six duchies is fairly likely to appear, even if (s)he might not someone known from previous books. It would not be all that surprising if one that might come up into the mountains would be one (or more) of the descendants of Molly. They have all inherited a certain level of adventurousness and curiosity, both from Burrich and from FitzChivarly.
As the dragons come into their own, it is quite likely that they too will enter the skill river, and then they will also sense the skill use of the six duchies folk. Six duchies coteries may also sense the brooding power in Kelsingra through the skill. A pool of 14 dragons and their Elderling keepers will no doubt cause a certain bubble of skill that others of such skills might just sense. Sense, but not necessarily understand.

As for who Thymara ends up with... That is impossible to say. Sintara has managed to turn her quite well towards the classical dragon queen mentality.