Rumours suggest the new Sims will be more diverse and more social.
EA has launched a The Sims 3 teaser website, which currently notes "more information coming soon". Soon meaning March 19, when a whole bunch of info based on what was shown at an EA showcase will be unveiled.
However, there is already some rumoured info. Rumour queen Surfer Girl has posted to say that The Sims 3 will ship simultaneously for PC and Mac and mentioned an Artificial Intelligence talk where EA's Richard Evans discussed how future Sims will be "more individual and more social at the same time."