@onions: That is the question...
It seems like a deliberate change. The image of "Vintage Minifig Collection Vol. 2" on S@H also shows the logo printing further down. But why? It's just wrong - and they had managed to get it right in Vol. 1. It's not like the helmets, where the old shape is no longer available. Time for Ask Lego, I think.
@Jettbacca: Which heads are you referring to?
The actual heads in the Vintage Minifig Collection sets are all the plain yellow faces. The colour of the "visors" in my other pictures is simply the way I like them. I think the red visor looks good with a white spacesuit, but I would not want it on a red spacesuit. I guess the blue and green would also look good with the white but I just happen to have more white spacemen than red ones and more red trans bricks than blue or green ones.