I'm pretty sure it's public knowledge at this point, especially when posting about Demandred theories but RJ has said in interviews that:
1) He is not Mazrim Taim (he actually repeated himself multiple times on this point)
Taim is not Demandred in disguise.
How do we know? Because RJ said so.
Q: "It's been said that you mentioned that Mazrim Taim is not Demandred. There seems to be some confusion on whether or not you said that."
A: "Mazrim Taim is not Demandred."
[Matthew Julius, post-COT signing, Dayton, OH, January 16, 2003]
Tim Kington concurs:
Q: "Taim is clearly not Demandred, right?"
A: (Disgusted) "I've said that before, and it's not Taim, it's Ta-eeem."
The same response was also reported on wotmania.com (*awww the memories
, in LiveJournal's Wheel of Time community, and in several emails.
2) As of Book 9, we have not met his alter-ego or cover identity if he has one on-screen.
All of these can be debunked or contested for various reasons, but it's not necessary to do so:
Q: "Have we yet seen the alter ego Demandred presents to the Third Agers on-screen?"
A: "No." (I asked twice to make sure.)
[Michael Martin, Dayton OH signing]
So, if Demandred is disguising himself as someone, it's not someone we've met so far.
3) We can update our records to indicate that Demandred alter ego hasn't been seen on-screen as of book 10.
From Etzel's post:
"Someone asked for clarification about whether we had seen Mesaana's and Demandred's alter-egos on screen. Sanderson said that we had seen Mesaana's alter-ego on screen as of Knife of Dreams, but that we had not seen Demandred's alter-ego on screen as of Knife of Dreams. Sanderson would not elaborate on whether Demandred's alter-ego had been seen in The Gathering Storm —Sanderson didn't want to narrow down the suspects for us if Demandred really had appeared in The Gathering Storm."
1) He is not Mazrim Taim (he actually repeated himself multiple times on this point)
Taim is not Demandred in disguise.
How do we know? Because RJ said so.
Q: "It's been said that you mentioned that Mazrim Taim is not Demandred. There seems to be some confusion on whether or not you said that."
A: "Mazrim Taim is not Demandred."
[Matthew Julius, post-COT signing, Dayton, OH, January 16, 2003]
Tim Kington concurs:
Q: "Taim is clearly not Demandred, right?"
A: (Disgusted) "I've said that before, and it's not Taim, it's Ta-eeem."
The same response was also reported on wotmania.com (*awww the memories
, in LiveJournal's Wheel of Time community, and in several emails. 2) As of Book 9, we have not met his alter-ego or cover identity if he has one on-screen.
All of these can be debunked or contested for various reasons, but it's not necessary to do so:
Q: "Have we yet seen the alter ego Demandred presents to the Third Agers on-screen?"
A: "No." (I asked twice to make sure.)
[Michael Martin, Dayton OH signing]
So, if Demandred is disguising himself as someone, it's not someone we've met so far.
3) We can update our records to indicate that Demandred alter ego hasn't been seen on-screen as of book 10.
From Etzel's post:
"Someone asked for clarification about whether we had seen Mesaana's and Demandred's alter-egos on screen. Sanderson said that we had seen Mesaana's alter-ego on screen as of Knife of Dreams, but that we had not seen Demandred's alter-ego on screen as of Knife of Dreams. Sanderson would not elaborate on whether Demandred's alter-ego had been seen in The Gathering Storm —Sanderson didn't want to narrow down the suspects for us if Demandred really had appeared in The Gathering Storm."
"Those who think they have no time for bodily exercise will sooner or later have to find time for illness."
This message last edited by RugbyPlayingAshaman on 10/12/2009 at 08:22:08 PM
C'mon People, who the hell is Demandred 
- 09/12/2009 09:22:01 PM
1566 Views
- 09/12/2009 09:22:01 PM
1566 Views
Faile *NM*
- 09/12/2009 10:47:56 PM
512 Views
Think about it
- 09/12/2009 11:19:04 PM
897 Views
They're both Saldaean and have never been seen together! 
*NM*
- 09/12/2009 11:36:46 PM
457 Views
*NM*
- 09/12/2009 11:36:46 PM
457 Views
More likely, the hook-nose is too hard to cover up 
*NM*
- 10/12/2009 01:23:32 AM
359 Views
*NM*
- 10/12/2009 01:23:32 AM
359 Views
I officially endorse this theory. Anything to see Faile balefired. *NM*
- 10/12/2009 02:16:49 AM
355 Views
I like Faile. She has balls. And Perrin's as well, for an extra set.
- 10/12/2009 03:23:31 PM
688 Views
According to RJ, some guy we've never seen on-screen or heard a POV from.
- 10/12/2009 03:20:48 PM
762 Views
But we might have seen him in The Gathering Storm.
- 10/12/2009 03:38:37 PM
643 Views
Possible, which is why I say he is some random guy we've never heard of before.
- 10/12/2009 03:56:53 PM
690 Views
Galgan
- 10/12/2009 06:08:07 PM
804 Views
Galgan was onscreen in KoD, where Suroth has a tantrum at him. *NM*
- 10/12/2009 06:26:00 PM
342 Views
Citation needed
- 10/12/2009 03:43:23 PM
759 Views
Re: Citation needed
- 10/12/2009 03:55:04 PM
952 Views
There's always Lan: Gathering the Malkieri, no POVs in the main series *NM*
- 10/12/2009 09:27:48 PM
379 Views
Among other reasons against it, Lan was seen on-screen before TGS.. *NM*
- 10/12/2009 09:31:30 PM
424 Views
my gut is telling me that King Darlin of Tear is actually Demandred
- 18/12/2009 02:47:35 AM
858 Views