Not sure when to come but
http://kotaku.com/gaming/it.s-real/sixaxis-rumble-confirmed-by-scea-employee-277564.php
http://kotaku.com/gaming/it.s-real/sixaxis-rumble-confirmed-by-scea-employee-277564.php
Today, a Sony Computer Entertainment employee confirmed directly to me that the SIXAXIS with rumble is coming.