So apparently there was a hotfix applied today to Windfury Totem, per Nethaera on the official forums:
Windfury Totem has been fixed (for real, this time) so that instant special attacks such as Slam and Sinister Strike will not trigger its extra attacks. On next swing attacks such as Heroic Strike and Cleave will continue to trigger it.
This is a fairly substantial change to the effect, especially for rogues.