Network play - well it didn't really clarify any more about the previous issues raised, just added two more network mode explanations:
"Soul Direction"
The actions of all logged-on players affect the gameworld. Absolutely no explanation about how this system works. Depending on the actions of all the players, the monster population, items type and distribution, strength of phantoms, etc. will change in different areas. An inaccessible area may suddenly become accessible, with a ladder appearing, etc. (See screenshots on site).
Network Invasion - PVP!
To start, no there is no info as to whether this can be 'switched off' if you login. Also no info how another player is selected, etc.... All it says is that if a player has a specific "black stone" special item and perishes, he can invade the gameworld of another player as a "black phantom". Win and he gets resurrected. Lose and he loses "soul level". The "black phantom" form will be of a higher level than the deceased player is currently at.