Sure, it's something that looks new and good - minding how current icons are having a rather simple style to put it mildly, but that's not a technological advancement like introducing Ribbon interface in Office 2007. And sadly, that's how MS, Apple and others are trying to portray all these barely significant UI changes - as features.
Don't get me wrong, good looking UI is important but I'd be happy if cosmetic changes would remain cosmetic changes and be treated as such. I can appreciate visual improvements and work by myself and I don't need, want to be instructed by marketing teams to feel "enthusiastic" about such changes.