Unfortunately, blu ray's are a mixmatch when it comes to region restrictions. It usually depends on the studio distributing the disc, I seem to remember Fox blu-ray's being very strict on regions. Some however will play on all.
Your best bet is to wait until it comes out, someone will end up testing it and finding out what the restrictions are. There are a few forums dedicated to it I used to use, as my PS3 is USA even though I'm in the UK. Google should turn them up, try blu ray region compatability or something as a search term.
Personally I only ever buy blu-ray's which work on both regions (A + B), as I have a UK PS3 in the living room

I have a sizeable library of them but there are some good titles which are region dependent, like the Ice Age series..