People need to get into their heads that there is no way they could suitably put the Hero of Ferelden onscreen. I'm sorry, it just can't be done.
This isn't Hawke who has a voice and who's personality really could be summed up as one of Diplomatic, Sarcastic or Aggressive (DA2 itself actually "sets" your Hawke's personality at some point based on dominant type of response).
There's such a huge range of variables when it comes to the Warden.
Hawke is Hawke, he's Bioware's character more than he is the player's, the difference between my Hawke and another player's Hawke comes down to appearance and the decisions made, that's it.
Contrast that to the HoF who is a completely blank slate to write into - how do you account for all the possible variables, including that he's long dead? How do you account for the wild variation in personalities between different players? Or the fact he had no voice?
Whatever Bioware do, a lot of people will be left disappointed or angry that their Warden doesn't behave\sound\talks like their headcannon dictates he would.
The HoF should have been more involved, perhaps he will be, but I don't think that will ever be as an NPC you can actually interact with. I'd love a DLC that involves looking for the HoF or helping him and doesn't actually show him onscreen.