FW New H.H. Imperial Fists-set!

Very nice. I expect many IF and Templar players will be very excited.

He does look cool but he does'nt seem grand enough to me to be Sigismund. He seems much less impressive then the likes of Typhus or Kharn.

No, not really. Not enough to be Sigismund anyway. Maybe it's early and if I saw the full model painted and on a large scenic base like the previous characters I mentioned then I would think differently but at the moment I would expect them to be parts from an IF Command Squad kit as Khorne's Fist suggested.