The official date for the PS2 online launch is 22nd May. But there are a lot of people that dispute that it will happen so soon. Most people are of the belief that it will happen around August some time.
I also read that the PS2 will connect to a 'super hub' and not the internet as we know it. No surfing, no PesInsight. Just gaming. Which is fine by me, but I feel a lot of people will be disappointed. The first online game (apart from Tony Hawks 3) will be 'Socom' which will be released as a package with the Sony internet adaptor for about £50-£60. A fair price, I think.
Going online is the next big step for PES, but I don't think it will happen until PES4 is released. PES3 will be slightly on line (transfers & updates etc), but online matches are a long way off. But one day.....................