SAW 3D ENDING???????

Burg stated, "In every Saw movie, we left questions open and in Saw 3D we answer every question the audience has ever had". That was almost true but, the one question I have is, WHO WERE THE OTHER TWO INDIVIDUALS WHO AMBUSH HOFFMAN at the end???? and is their any other questions ( YOU the YAHOO USERS) have, because I couldn't think of any other SAW questions.