Well the PS3 will be released tomorrow so we won't have to wait long to know lol but in the magicbox I found the link to the japanese compatibility list. Here's the link for it: http://www.jp.playstation.com/ps3/status/

I searched for PSU, and even the premiere disc is on the list lmao And here's the google translation:

"Item turn: SLPM-66031 * sale day: There is no report that 2006/08/31 to presently in regard to play big hindrance has arisen."

Is it saying it works? lol I don't doubt much that it'll work offline but I'm wondering offline since the PS3 has Wifi (600$ ver) O_o? though I think both versions have an ethernet port so in the worst case you'd use that I guess?