Nexus 5 is a curved phone

Designer Sph1re from Deviantart has created the next Nexus Phone concept, which he calls the Nexus 5. 

Features :

•  very rounded and curved
•  It’s shaped like an hourglass and I am extremely curious how such a model would feel in the user’s hand.
•  Android 4.1 Jelly Bean
•  WiFi and LTE