Heard theres a speculation that hes a Dunmer and hes a reference from Morrowind. Can anyone tell me for sure?

Under the helmet he's a Redguard.

The reference to morrowind I think you're talking about is the other tough ebony clad person from there:

http://www.uesp.net/wiki/Tribunal:Gaenor

Gaenor. But no, he's redguard, though I think he's the avatar of Ebonarm.

In strict game-mechanics terms: He's a Redguard.

Though I suspect he's a Divine being. An avatar of Ebonarm, whom is a patron to warriors. Specifically, Redguards.

The Ebony Warrior is a Nord in a Redguard's body.

I recall reading somewhere that the original Ebonarm was a Nord, or something to that extent.

His description certainly was very Nordy:

http://www.uesp.net/wiki/Lore:The_Ebon_Arm

I believe that the Redguards are the ones that mostly revere him now, so his change in appearence could be to reflect that.

A very dark Redguard though as some people suggest he is very likely some Et'Ada

I remember imagining him as a red-haired, blue-eyed black guy the first time I read this a long time ago.

I can't be the only one, right?

LOL, like this?

http://www.uesp.net/wiki/File:SR-npc-Fihada.jpg

I hope not. That's quite the bad hair combination.

edit: Oh, red. Well, close enough, lol.

I hope Reymon Ebonarm doesn't look anything like this guy http://images.uesp.net/d/d7/SR-npc-Fihada.jpg

Blue eyes apparently has become a common trait among Redguards in Skyrim now.

Edit: viking'd

Skin tone, yes. The images in my mind were pretty garish thanks to that opening paragraph, so by the time Ebonarm's description came about I was like "Eh, everything else is already bright as [censored], why not?" Eugh.

I thought Fihada was a Dunmer at first. Then I got a good look at him and the https://www.youtube.com/watch?v=5ZJbWp2CTbk

Redguard, thought that was a well known fact.