Apple probably WILL keep the handles somehow... those things are handy to move. That French mock up is just someone speculating badly by editing down a quicksilver.
ALso maybe there will be three accessible bays in front rather than two in a new design.
The only bad thing about the handles as is, is that it might make stacking other drives and modems on top 'slightly' awkward. But I don't think anyone should expect that much difference in the case design at all... just more room inside, better access to bays, and perhaps a something closer to snowy white. The next gen macs will probably settle around snow and a brushed metal look, until they think that looks boring.