This is absolutely a HARD one to guess, because all the characters listed can be utilized in the current and future storylines. Anne and Shane already I figure would be logically a must with Theresa's return. Clyde also is already tied in to interview with Will and Ben is now contract (have no idea what writing they will do). Perhaps Will actually forgives Ben?
I can see Philip returning out of the blue to be head of Titan since Brady and Sonny, in my opinion, will let both of their personal lives get in the way of business. Sonny most likely will be betrayed by Leo, and Brady will be stuck in the Eve/Theresa love triangle about to happen. Then Chloe can also be in a love triangle with Lucas and Philip down the line. It will make Kate hate her even more.
As far as the Hernandez family goes, Dario to me would be logical to tie in the storyline with Theresa and Chloe trying to escape Mexico. Though Xander would be a twist for Victor to send him to help Theresa, considering their past!