I think in The Wind Waker, there will be varying types of Molblins, sort of akin to the different kinds of Space Pirates in Metroid: Prime.
In this guy's heart, there are only two types of Molblins for the time being: red and blue.

Maybe the more pig-like Molblins are the red ones and the more bulldog-looking Molblins are the blue? Or the other way around?
I kinda like the new Molblin design in Wind Waker. One, they're more like bandits than hulking warriors (which makes sense if this incarnation of Ganon is a thief again), and two, because in the first LoZ manual they're kinda wiry anyway.