Speaking on the Vertigo panel at Comic-Con International, the artist revealed that the forthcoming issue will have a 'choose your own adventure'-style format, reports CBR.
"We wanted with Unwritten to play with the idea of different genres and different formats of fiction," he said.
Gross and writer Mike Carey's title is set in a world where the lines between fiction and reality are blurred.
The issue will reunite Carey and Gross with Ryan Kelly, who worked with them on their previous Vertigo series Lucifer.
Unwritten #17 is out on September 8.