A few new clues have come out to support the rumor that the fourth-generation iPod Nano is going to have a taller silhouette and a larger screen ratio...

A silicon case appeared at Alibaba that supports the larger screen rumor. It also would reveal a generally curved shape for the new Nano.

Also, iDealsChina has found a 3D imaging of the supposed Nano (above the jump) from "some unknown Canadian company" who used the CAD to design their case (below). While that sounds completely unreliable, we are reminded that iDealsChina was one of the first to secure an accurate 3D imaging of the now-infamous iPhone.