They improve it by giving him a removable helmet. I can't wait to see more!
I think I would rather see a Barbecue with a removable helmet like back in the show, but I don't know if I'd still call it an improvement.
While the original Interrogator had a relatively small head ( but cool enough to use for a custom BAT ), the only improvement that this figure needs is an accurately proportioned head.
I'm hoping that some of the figures will be first-time character renditions like 2007' Claymore (who appeared in The Traitor Gi joe 2 part episodes).