Assuming Neal = Henry’s father = Bae:
Poor guy. I wonder if he even knows what he’s going to find in Storybrooke. His estranged father, his long-lost love, the son he never knew he had, or the pirate who ran off with his mother/is seeking revenge against his father/flirting with his ex. That or an evil, shape-shifting witch who probably wouldn’t mind ripping out his heart.
This is why I hope he has a friend in August, who was slated to return for this episode. After all he's been through, he shouldn't walk into Storybrooke blind. Plus, I think August might be on a redemption quest to get his humanity back – maybe he hopes reuniting Rumple with his son will convince Rumple to make him human again. I don't have proof for this, of course. Just thinking out loud.
As for the reactions, don’t forget about Charming. I can see him finding out and lunging at Gold for some reason… 😕