They reused a chunk of the Cartmel Masterplan for a few New Adventures novelizations - there were a bunch of throwaway comments in S25 particularly about the Doctor knowing people he shouldn't have known on Gallifrey, and having some secret past that he didn't want revealed (and also the crazy Gallifreyan stuff he shouldn't have had access to when he did), which were designed to retrofit this more mysterious, slightly mythic past. One of the script-writers did a couple of novels where they wrote that bit up. (They also sort of tried to do the Ace bit as best they could, being somewhat hampered by the alternate stuff the novels had already done with her by that point. Overall, though, not that satisfying how they handled Ace in the end, in the NA novels.)