On the "new" IV and VI, both figures are a scaled back version of the original releases. They were only released in the Shanghai market to kind of give new collectors a shot at the classic armors. (not fact, just my perceived observation) They feature way less accessories, redesigned back flaps, (no more snap on flaps) and slightly less detailed pieces. The obvious parts would be the arms. Since they don't come with interchangeable armor or weapon pieces the arms have less detail. They also did not update the hands with angled repulsor hands, so that part is true to the original. If you have the Workshop Accessories set, you can update the hands since IV and VI are essentially the same armor.
To me, these figures were a "bone" being thrown to the Asian market so they could at least have something from the first figures. The new die cast VI is far better than the original IM2 VI and Avengers VI (opinion) because of the newer features, details, etc. I wouldn't hesitate to say that a newer die cast IV is coming at some point. If they're smart, it will include newer versions of all the old accessories, a better head sculpt, (maybe with the high tech crossword puzzle visible on the neck) no snap on flaps, angled repulsor hands, and maybe, another gantry. We'll see. I've preordered the DC VI, I would definitely order a DC IV.
Ryan
