I've played Origins many times, many different ways, and the only Wardens I've ever had that wouldn't be relevant to a clear and present danger to Thedas are dead. For them, there is the Orlesian SCAB Warden Commander. For the rest, it would be very odd for them not to be involved in some way in the events in Inquisition, and the same goes for all of my various Hawkes.
It's been what, 11 years in-game since I last saw the Warden? I'm prepared for the Warden to look a little different, and I have no problem with hearing a voice that might not perfectly match what I had in my head when I played the character.
For those of you so easily upset about it that the idea of an appearance of your old character horrifies you, or who insist that the company who wrote all of your character's dialog and created the setting and scenarios that defined it is nevertheless completely incapable of rendering it upon your screen in a way that would not crush your gentle spirit, well... setting aside for the moment the question of why you would buy a game those people you so distrust made, I hope for your sakes the Keep features an option for your warden to be replaced with a generic character, perhaps the Orlesian from Awakening, while retaining what your character did when it was relevant, before your headcanon turned it into a couch potato.
For the rest of us, there's no reason not to see a glimpse of our Warden with the love interest, on the throne, or putting boot to ass for the Grey Wardens.
And I wouldn't mind some sarcasm from Hawke, either.