Sorry this took as long as it did- the so-called "tech support" over there doesn't do a very good job of reading the questions given. Had to stress about this being about LAN play in a follow-up response and it seems to take them a day to make any sort of attempt to get back.
As i suspected LAN play isn't possible as it wasn't built into that game. If a game did have the ability for it it would work similarly to how the PS2 did it, connecting the two via ethernet to their ports then one would go first as the "host" and then the other system would join. We probably won't be seeing any sort of LAN play with the PS3 anytime soon.