Ok, so I just had another idea for what the twist could be. With all the guesses there have been, I don't know if someone else has already mentioned this one or not, so if one of you already said this, I'm sorry. Haha, there are so many guesses, I'm going to laugh if none of us are right. Although I'm kind of hoping none of us will be, because then it would be totally unexpected, which would be awesome. Chances are though that SOMEONE will be at least really close. We'll just have to wait and see.
Anyway, I was just watching sneak peak 1 again and it kind of seemed to me like Adam might have already known all about Creddie and Seddie before he went "poking around some forums online" (if he even did that). Almost like he's lying about not knowing much about it. What if he's like some ultra crazy super-fan himself and dating Carly is all part of some plot to get his favorite ship together. Or maybe he's working for Nevel or Mandy or someone. I don't know, I just think that maybe Adam isn't who he claims to be. Then again, he could just be a nice boy who likes Carly. Again, we'll just have to wait and see.
Also, has anyone noticed that Mandy isn't in any of the promos or sneak peeks? You'd think she would be leading the pack of iCarly super-fans, but she's nowhere in sight. Which brings me back to the idea that she may be devising some plot behind the scenes and Adam is a part of that plot.
Wow, I just realized that I'm completely insane. You should probably disregard everything I've just said.