Remember Double Impact? The awesome Jean Claude Van Damme vehicle of the early 90s? No well someone at DC does cause they're remaking it with Batman. Ok so they're really not, but I wanted to do a double rainbow joke here and like 30 other bloggers beat me to it.
"Starting in November, DETECTIVE COMICS, BATMAN and BATMAN AND ROBIN will feature the ongoing adventures of Dick Grayson as Batman, with Damian as Robin. Meanwhile, Bruce Wayne will take center stage in the pages of Grant Morrison and Yanick Paquette's BATMAN INC. and writer/artist David Finch's BATMAN: THE DARK KNIGHT."
So there you go, two Batmans in four different monthly Batman titles, most of them written by Grant Morrison. Doesn't sound like a cash grab to me at all.