according to an xbox interview with cory ledesma (links on caws.ws but it wont load right now) the rock and steve austin are going to be DLC for xbox360 and ps3. some sites are offering a code to get austin, some a code for the rock as a pre order gift.
i have a ps3 but always got the ps2 smackdown vs raw because I enjoyed the hacks and using the npc. I was very fortunate a friend of mine sold me his ps3 for $120 when he won a raffle and got a free xbox360. otherwise id be in the same boat as every one else on here. I wouldnt be able to afford even the new $300 ps3.