CHeck out this article from IGN http://wii.ign.com/articles/802/802392p1.html
"Where NBA Live 08 really sold us, however, was in the online portion of the package. Details are still pretty sparse due to the game's level of completion, but EA did share an interesting note with us. NBA Live 08 supports console vs. console play, which means up to eight players can go online and face off against each other. Since there are only two Wii systems connecting, EA treats it as a "team vs. team" situation, so you can play online with either one, two, three, or four controllers supported on each console. There were also rumblings that once connected, consoles could actually change players on each team; so you could go online with a group and then trade players pre-game and do a little mixed online competition. We'll wait to see that one in practice, but according to EA it's entirely plausible. Regardless, four-on-four online is confirmed, so get your teams ready, organize tournaments on the message boards, and kick a little ass via eight player online."