User blog comment:The Dragon Demands/Season 5 trailer officially released/@comment-1600847-20150130164618/@comment-1600847-20150131152307

I highly doubt they'll cut Aegon entirely given the role he's going to have in book 6. At most, they'll merge him with another character, but cutting him entirely wouldn't make sense. It'd be like cutting out any other major character. Regardless of whether he's a Targaryen or a Blackfyre, he's going to have a big role to play. Though if he is merged with Trystane, it would confirm he's a Targaryen, as the Martells never supported the Blackfyres and wouldn't habour one of them.