The Warden should not appear because it's very nature is him/her being a blank sheet, the character entirely belongs to the player and Bioware thankfully acknowledges this.
This thread is a prime example of why introducing the Warden would be a bad idea. One player said the Warden can act more 'evil' if 'evil' choices were picked, such as annuling the circle and killing Connor. Okay, well, my human female Cousland did both and was definitely not evil, she was a devout Andrastian and simply picked those choices because they were the best options to take in her mind with minimal amounts of casualties.
A second player has voiced that they want Commander Shepard to voice the Warden. Again, I would hate that. The voice actors for Commander Shepard are obviously American/Canadian, and Fereldan is based on England. The only American accents heard in DA:O are from City Elves/Dwarves. So yeah. Commander Shepard could voice them and it would fit the story, but **** having Commander Shepard voice my noble when I've only ever imagined her having an English accent.
The Warden story is done and over, but I do agree that Bioware stupidly stated that the Warden was doing stuff in Inquisition. I think sending him/her on a mission to end the Calling was folly; Bioware simply should have left it vague OR acknowledged the ending that YOU as a player picked. Romanced Leliana? Warden was off adventuring. Romanced Zev? They were together off adventuring. Queen/King Consort? They were occupied running a state. Romanced Morrigan? Working behind the scenes and/or retirued in the Eluvian. They should have just left it vague, and once again their choice to have the Warden occupied with 'Warden' business demonstrates how volatile this situation is and why they should avoid rather than handle; I have two canon Wardens, and my Male Elf mage, I was fine with him trying to end the Calling, it even kinda fits his character. However my Human Female noble who was ruling as Teryna of Gwain/Queen to unhardened Alistair/his only advisor? **** having her prancing off into the Deep Roads, her ending was completely fine and I loved that. Instead, I as a player have to endure that the Warden I created is doing something entirely out of character.
So yeah, I'm grateful that Bioware seem disinclined to touch the Wardens story directly, and I think it's for the best. It's a massive mine field that would ****** off too many players if ever touched/approached.