it’s all about display
This particular display caught my eyes in Ivan’s report from CES2010 :
“Experia phone from Sony Ericsson that had half transparent screen, which looked very nice, designy and conceptual.”
Now you can type from the back of your cell! I had always want to make a phone with keyboard on the back, since a lot of us don’t need to look at keyboard anyway (more true in China where we’re crazy about texting). Now with this translucent screen, you even get visual feedback where your finger is.