?? I still see the zoom bar on my camera (an upgraded iPhone4, not iPhone4s). Pinch to zoom also works, although I personally find it awkward and imprecise. I don't use the zoom all that much anyway, but I think I'll continue using the zoom bar instead of the pinch.
It's kind of hard to get the bar to appear, though. It seems like you have to give a little pinch first and then the bar pops up.