Everything? Seriously, pretty much everything about next season fascinates me right now. Defense, prospects, which forwards win spots, can Backlund finally put together a full season, how's Bennett going to look, how good is Monahan going to be, can Hudler keep it up...
More generally, I'm excited to see the development of this team. There could be very few changes from the end of last season, or a ton of changes, or anything in between. Even the type of game we'll play isn't set in stone yet IMO. Really interesting to see how that shakes out.
Our goaltending is really the only thing that worries me a bit. I hope one of the goalies just takes the #1 spot and holds it. Preferably one of the Finns
But if I'd have to single out one thing, I guess I'd have to say Johnny Hockey.