Description of differences:
We've already seen Frenzy & Rumble way back when they were first added, but now we have pictures of Scourge, G2 Optimus, and Wheeljack.
Scourge has stripes all the way down his wings, red windows, metallic paint on his chest, a Decepticon symbol on the center of his chest (rather than his left breast), red eyes, lighter gray for the hands, darker gray for the gun, more pink finger nails.
G2 Optimus has clear blue instead of clear orange, no blue in vehicle mode, though he retains the flames the red does fade into black on some areas, different paint apps on the shoulders, red paint biceps, red details on his knees, G1 Autobot symbol on the side of the truck, silver painted gas tank area.
Wheeljack has metallic green paint, more elaborate stripe detailing on his chest, more green on the side of the car. There may be more differences, but it's hard to tell with neither figure being released yet.
Note the pictures of Frenzy & Rumble on Amazon.co.jp have always been of the United version since they've been in color.
Randy
Higher Res Images for your convenience at the Allspark.
Hopefully this will put to end finally that the images shown of United Optimus, Scourge, and Wheeljack were actually the RtS/Generations versions up until now.
Randy