I think PES4 online will be a simple affair, it does'nt need to be flashy, like what hitmanuk2k said we can organise/manage the leagues etc on the web rather than slowing down a server with crap. Microsoft and Konami will leave all that to the enthusiasts to handle. As long as they provide decent fast servers thats all we need.
Remember we still have sometime before its released in mid November so I'm sure hitman will answer your questions about rules ect nearer the time.
One thing I would recommend though is for anyone who thinking of joining be best have a decent broadband coonection,,,, at least a 512k connection.