A trailer has been released! Not much to see though, it seems more like a PC trailer really. But still interesting and amusing. :-)
http://multiplayerblog.mtv.com/2010/06/07/exclusive-the-sims-3-console-debut-trailer/
http://multiplayerblog.mtv.com/2010/06/07/exclusive-the-sims-3-console-debut-trailer/