Now a post on American McGee's blog has revealed the developer's second project as an "[Unreal Engine 3] based, big publisher, multi-platform, twisted tale project."
The unannounced game is in pre-production at Spicy Horse, American McGee's Shanghai, China-based studio.
"At the moment this is purely for recruiting purposes - an official announcement will come when the time is right," wrote McGee, who is seeking to fill a long list of production roles. "This is going to be a world-class product, and we're hoping to attract world-class talent to the team."
"American McGee's blog" was enough for me. I'd play that game.