Optical Image Stabilization is great. It's always there for you, and it can mean the difference between an unwatchable 'action' sequence and a clip that's actually enjoyable...
Source: http://www.phonearena.com/news/Nexus-5-likely-coming-with-an-OIS-camera_id47409
Source: http://www.phonearena.com/news/Nexus-5-likely-coming-with-an-OIS-camera_id47409