I'm right handed and i've always worn my watch on my right wrist , I didn't actually think about it being on the wrong wrist , it just seems natural for me.
Since i pre-ordered the Apple watch i've been putting my watch on my left wrist to see if i could get used to it, but it feels weird to me so i'll probably go back to using it on the right.
I'm the same & so is my mother -- right-handed wearing watch on right hand. If it were just a watch, I would wear the Apple Watch the same way but since I will interact with it, especially using the crown, I'm probably going to try it on my left hand to begin with. I just don't know that I'm dexterous enough to manipulate the crown with my left hand.