"We will start pre-production towards the end of the year, and start sometime next year. And [it'll] come out a year, year and a half after the third film."
There's been lots of speculation about whether Dan, Emma and Rupert will return for the fourth movie.
The return of Chris Columbus
"My hope would be that it'll be the same cast, it's too early to tell though." is Heyman's comment. "We've only just started writing the screenplay. It's early days yet."
There have also been rumours that Chris Columbus who directed the first two films, but isn't directing the third, will return to direct the fourth.
"Maybe Film Five," says Columbus. "Four is starting a little too quickly, but Five is a possibility."