Unfortunately the Asus Zenfone Zoom was locked away and we didn't get a proper hands-on with it.
It has the same hardware base as the Zenfone 2, but by adding just 1mm to the overall thickness of the phone Asus found room for a 3x optical zoom lens. It has optical stabilization too.
The rest of the camera specs are essentially the same as on the Zenfone Zoom's sibling - a 13MP sensor with 1080p video capture and a dual-LED flash. Asus did add an LG G3-style laser autofocus to speed up shooting.
The Asus Zenfone Zoom will come with as much as 128GB of storage, though Asus is mum on the lower bound - the Zenfone 2 drops to as low as 16GB.