HomeLAN Fed has a story up based on a Yahoo! News Story that is no longer available revealing Rebel Without a Pulse as the title of the upcoming debut title from Wideload games, the developer started by Bungie alumni. The Yahoo link was apparently to MacCentral, where as of this writing there's no longer any trace of this story if it was posted there. Word on HLF is that the Widleoad team is handling the Mac version and Aspyr will handle the PC and Xbox ports. Here's part of the quote that they have preserved from this:

Based on an updated version of the same engine technology used in Bungie's first person shooter "Halo," "Rebel Without a Pulse" puts players in control of a wisecracking zombie named Stubbs, "who takes on an ultra-modern city of the future using nothing but his own carcass and the weapons of his possessed enemies." The game is rife with tongue-in-cheek humor, a strong storyline and innovative combat techniques.