It doesnt really mean anything at all.

Sativa will normally have more fingers. My lowryder only ever got 5 fingers, while my indian skunk got up to 9 fingers.

I also think it's something to do with light intensity, cos when i fist started growing, the plant only ever had 3 serated leaves, all the way up, but the next time i grew the same strain i got 7... And it think its because the second time i used better lighting.