The ITV soap's producer filmed a tantalising video for the official Emmerdale Instagram account in which he couldn't hold back his excitement for the upcoming changes.
"I think some of the best things Emmerdale does is surprises and pulling a rabbit out of the hat when you least expect it," Iain teased.
The first massive spoiler was that there will be a new arrival to the Dales, and it will be in the form of a character with an important connection to the Dingles.
"I can reveal that it's not a Dingle actually, but [he will be] connected to the family in a way I think people will find really interesting," Iain explained.
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It will just tilt the whole Emmerdale universe on its axis slightly
"He's going to be sexy and dangerous and one of our characters stands to get her heart trampled on which I think will be really exciting as well."
With fans of the series already excited for some fresh blood, Iain continued to revealed tidbits of information.
The producer teased: "There's a really massive surprise coming in October, something that even the character it happens to hasn't seen coming. It will just tilt the whole Emmerdale universe on its axis slightly."
Emmerdale's showrunner also revealed that the series will explore a "serious issue-led story that will be heartbreaking, truthful and really relatable for the audience," but also mentioned that there will be a big story to come for Aaron Dingle (played by Danny Miller) and Liv Flaherty (Isobel Steele).
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Claire King as Kim Tate in Emmerdale and now in Coronation Street as Erica
Emmerdale: The boss has teased a number of changes for various characters
The producer finished by teasing a big change to one of the show's key sets, indicating a handover of power and a potential power struggle between some characters.
The soap's latest drama has finally seen rapist Pierce Harris (Jonathan Wrather) get arrested for raping his wife Rhona Goskirk (Zoe Henry).