The "knight" costume is Havik's alternate costume. It was a mistake made by somebody.
Peace Out

but there was already a subect saying that both costumes existed....WTF!?...i think scorp has a KNIGHT costume...but i could be wrong

There is meant to be a knight armour type costume...no mask, silver armour, bones comming out of his back to form a collar, and goes down his back. I suspect that the alt costume that was shown to everyone is his 3rd alt, his original. There is deffinatly meant to be more than 2 costumes so I guess this is the case regarding his silver armour one

are you talking about scorp or havik?

go to this thread: Mortal Kombat Deception List: Everything Known So Far (Updated September 18th Added Some Charcter Renders****Give Your Character Select Screen Predictions****Spoiler**)
Peace Out

No, it's not a mistake!!! Scorpion have a knight costume. In the games convention in germany ( leipzig ) our admin from mortalkombatgermany saw it there. They describe it with one word... AWESOME!!!

MortalKombatDE was the one who said the stuff on Scorpion's 3rd. It was true that Scorpion had one. I PMed him and this is what he said.
Yes, i was it at the "Games Convention" here in germany, there was a XBOX version (85% done), where u can play in there alt. outfits.
But Bad News, i was talking to "John Vogel" yesterday, he told me this outfit iss no more, it was just for testing, and don't fit scorpion.
The MK4 alt. iss now official. This iss really bad, none believes me, but Vogel said, for every Charaktere there create so many costumes they never make the final cut!

Don't say that Moster_For_Satan...I believe you. Actually I believe both you and the guy who went to Games Convention saying that it existed. They probably had it in that version, and then took it out. Afterall the Game Convention version was not as far through completion as the more recent gamers day events.
But if they did take it out...that kindda stinks. Honestly...his desciption sounded SO fucking kool! And he seemed more than overly-excited about it, sounded so powerful...and I think it would/would've made da best alternate for him. His alternate has always kindda been the same for the last two games. Just him without a mask on. The armour knight one sounded like a step a new BADASS direction for Scorp's Alt.
Let's hope they change their mind again and put it in ;)

Uh man... that sucks. I believe you too, mobster. But this are bad news. I pray that boon will change his mind and give it back to scorpion. It sounds so awesome... I'm sad

He said he played scorpion in this "knight" costume... but he says he had a little skin in his face, and a helmet... this sounds WAY too much like Havik... which is kind of sad since I wanted 3 costumes 4 each... :'(

The knight armor sounds better that the umk3 custume, why cant they just put 3 custumes in the game.

didn't those germans also say that havik was shao kahn. lol
germans

No, but i can only speak for me. And that news with the alternate costume for scorpion is true. It was not a speculation. I still hope that boon will change his mind...

If it doesn't appear as one of his costumes, Boon could atleast add a pic of it to the Krypt so people could look at it.