Deus Ex 3 being developed exclusively for PC. "Only the PC version has been announced so far," he wrote on the official Eidos forums, diplomatically addressing a story that originated from a (now corrected) article on Bit-Tech. "I dunno where that website is getting its info from!"
We dunno if these comments preclude an exclusivity announcement in the future but, as John Walker notes on Rock Paper Shotgun, the situation isn't a conspiracy so much as "a matter of crossed wires." The Deus Ex franchise is certainly no stranger to consoles and, considered from a commercial viewpoint, it seems likely that Eidos and Square Enix would want to share their collaborative efforts with as wide an audience as possible.