Although the plan had been to include PC, Xbox 360, and PlayStation 3, at this point only the two consoles will be supported during the Call of Duty Elite beta that began today.
No reason for the decision was cited. An updated version of the beta FAQ states, “Currently, we do not plan to launch a version of the beta for the PC version of Call of Duty: Black Ops.”
The FAQ also reveals that the beta is launching only on Xbox 360, but will soon bring PS3 players into the fold. There is no exact date for when PS3 players will get in, but at this point, the large majority of 360 players who signed up to participate aren’t in either, so there’s no reason to get angry over alleged console bias.