I have a question i have been thinking about for a while now and i was wondering in dawnguard is there going to be any unique wepons that look complely different just like how the daedric shrine wepons look different ?

Yes. Auriel's bow.

Also they will have dragonbone weapons, but I dont think that is what you meant.

*Weapons

And yes, they have Dragonbone weapons, and Auriels bow, not to mention crossbows

It's a good chance we'll be seeing some new Named items like Auriels Bow.
It stands to reason.

Supposedly Auriel's Bow is in the game. And it's an Aedric artifact, so I'd wager it'd look unique. Other than that, I can't say.