He is the screenwriter, this is the sinopsis:
 
 Sinatoro, a man with no past and no memories; the sole survivor of a car crash in the middle of a desolate American desert road. When he encounters the beautiful daughter of a cult leader, she convinces him to help defeat the forces of evil, which have overrun her town. His journey pits him against the world’s most dangerous gangster and allies him with a deranged astronaut, a drunken cowboy, and an army of hobos. As Sinatoro travels through an American landscape made of pop culture nightmares, he struggles to understand who he is and why everyone is out to get him.

Interesting to say the least.

Both are happening, along with him being the driving force of teh Batman books, his massive multiverse story and his Indian mythology war over Dynamite that is supposed to become an animated series. Morrison is a busy man these days, I love that.

Sounds good, it definetely does sound like a story that Grant would write.