I think it just might come to PS3, I of course have very little to back it up but... Go to this site for some mind candy :3
Now, I speak very, very little japanese, so correct me if I'm wrong here but... EQII apears to have been published by Squeenix in japan, for PC of course. (This is SE's official site)
If EQII is in POL's segment of online games, then I find it quite possible that FFXI and EQII (Expecially after Sonys announcment of a HDD for PS3). Add in that PS3 and EQII are the creations of the same company and... well... Lets just say a PS3 version of EQII isnt that far feteched.
Xbox 360 version has probally about a 0% chance, for obvious reasons.
Just my 2 cents. I could very well be 100% off, just the ramblings of a hopefull sony fan.