I wouldn't expect Chester and Ephraim for TAR24. They've been pretty active, and while that's not an automatic assumption of lack of participation, they're pretty conflicted. Sure they're retired, but with the latter having a significant role on Fox Sports Live (which started after TAR23 was taping), it probably isn't the Houston guys. That does suck, as I expected them to return (but for TAR26 had that been a return of racers season). Maybe they'll get another shot in a couple years for TAR28.
Jessica & John I actually do not mind. Which also means I wouldn't mind if they didn't get cast this time. It'll probably be someone no one cares about, to the point where it wasn't even worth mentioning. Liz & Marie, Laurence & Zac, and Art & JJ would make the best sense, but per Asia's hit song, Only Time Will Tell!