User blog comment:The Dragon Demands/Season 5 trailer officially released/@comment-1600847-20150130164618/@comment-25358400-20150131115553

I'm still holding out hope for Stoneheart, but with Jaime in Dorne and Walder Frey already installed in Rivverun I'm not sure how they'll introduce her. Obviously they can't outright state that the actress is returning... that would give the game away. I still believe.

Faegon, on the other hand, is mostly certainly on the cutting room floor, and I couldn't care less. D&D don't even trust their non-book reading audience to remember who Tysha is. And correct me if I'm wrong, but Aegon was never mentioned by name in the show, just collectively referred to as the "Targaryen children" with his sister. Assuming the Blackfyre theory is correct (which I think it is) then there's even more reason to cut that whole sub-plot out, as they've not made any effort to establish the history of the Blacks and the Reds. They also should leave some things unspoiled for the books. The Trystane theory is an interesting one, but per Dragon: I hope not.