According to his blog, American McGee is starting work on a "UE3 based, big publisher, multi-platform, twisted tale project' - pre-production is starting soon".
The developer, probably best known for retelling of Carrol's Alice in Wonderland, is currently recruiting for people to work with him in China at his studio, Spicy Horse.
"This is going to be a world-class product, and we’re hoping to attract world-class talent to the team," McGee added. "If you’ve liked what you’ve seen/heard about 'Grimm', or were a fan of 'Alice' - then you’ll not want to miss a chance to work on this project."
He's now recruiting for a heap of positions for the team. Take a look, if you fancy it.