WolfsGamingBlog writes: "In Battlefield 3 gamers who owned Mass Effect 2 could unlock a special Mass Effect 3 dog-tag for their character to proudly wear whilst shooting people in the face. To return the favour, DICE have announced a last-minute cross-over which will let Mass Effect 3 owners get an exclusive Battlefield 3 themed kit for use in Mass Effect 3's rather awesome co-op mode."
I would have thought that because you've got a BF3 Online Pass linked to your Origin account you'll still get the pack on PS3. Don't hold me to that, though, as I could be wrong.
Thanks.
Also, if you haven't already, check out the Kickstarter fund for Auditorium Duet and please donate to Cipher Prime; that company is amazing and extremely deserving.