How can you improve on a great design? You make smaller! Go Pro has launched the Hero4 Session. It's 50 percent smaller and 40 percent lighter than it's big brother the Hero4 Black, however it  doesn't have 4k video recording, but it still maintains at 1080p and up to 60fps,720p and up to 100fps and at 1440p up to 30fps. 

It also can shoot 8MP still photos in either single, burst or time lapse modes.The Hero4 session is waterproof to up to 10 meters (33ft),no separate housing is  required. Connecting to the hero 4 sessions can be done via Bluetooth and Wi-Fi through the GoPro's Smart Remote or phones and tablets that are running the GoPro app.(available for iOS,Android and Windows Phone). The Hero4 session will be available starting July 12, 2015.