I think I found some concrete evidence concluding Neal isn’t Peter, I know, sad, right.
http://www.wetpaint.com/once-upon-a-time/articles/once-upon-a-time-season-2-spoilers-major-clues-about-neal-and-tamara
In this article the author mentions that Adam or Eddy said that no one has guessed the right theory about Neal yet, and Peter is one of the biggest theories, so I’m 90 percent sure their saying that he isn’t Peter
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Keeper of Swanfire's dream catcher, the Blue Fairy Plot Device, the contact name "Her", the lanyards, the trigger, the Netherworld room and necklace, Charming's quote on Thanksgiving, and PP's pic of Henry