The updated user interface for the sixth-generation iPod nano has just been released through iTunes, and we’ve had the opportunity to test it out. Here’s what’s changed between versions 1.1 and 1.2: Home Screen: Previously, the iPod nano presented users with a set of four icons at a time, allowing you to swipe between multiple Home Screens like an iPod touch or iPhone, and rearrange the icons to move them from screen to screen. The…