Fans already know that Mr. Gold took Emma and Henry to Manhattan to look for his son Bae. It seemed that that was the favor that Mr. Gold was cashing in that Emma owes him. According to Wetpaint on Feb. 12, Gold tells Emma that his favor that he's cashing in is to get Bae to talk to him.
So it seems that he was found, and Emma is very surprised when she catches up to him. Many fans think, and it looks more likely than ever based on the expression on Emma's face when she sees him, that Gold's son Bae is also Henry's father, Neil.
There are several other surprising details about the "Manhattan" episode, like the person that Gold finds with both eye sockets stitched shut. According to some, that could be the price of doing magic. As fans may remember, Bae left because Gold chose magic over him. While Gold is gone with Emma and Henry, Hook and Cora plan to look for the dagger that gives him his magic so that they can control him.
It looks like the "Manhattan" episode of "Once Upon a Time" is shaping up to be one of the best episodes of the season.