From what I understand, all of these figures (Generations, Movie-looking guys and actual Movie characters) were all part of the same line. Hasbro created Generations as a means to get more products on shelves at the same time as the more retailer-attractive yellow box line.
I think there was just a larger number of figures initially than they could fit into the yellow box line, and now that the glut has been cleared out, they're reformed under the yellow packaging with the rubsign gimmick.
It's basically just like the old Universe line now, except without an obvious "G1 SERIES" or something blurb.