The iPad mini (2nd Gen) models -- formally the "iPad mini with Retina Display" models -- use practically identical housings as the original iPad mini, but have a much higher resolution "Retina" display, as well as a faster processor and faster Wi-Fi (as well as expanded LTE connectivity on the LTE capable model).
Both of the iPad mini (2nd Gen) devices -- including this Wi-Fi only model (A1489) -- are packed in thin white and silver or black and medium colored gunmetal "Space Gray" cases and feature a 7.9" 2048x1536 (326 ppi) LED-backlit IPS touch-sensitive display, a dual core 1.3 GHz Apple A7 processor, 1 GB of RAM, and 16 GB, 32 GB, 64 GB, or 128 GB of flash memory storage.
Other notable features include dual cameras -- a rear-mounted 5 megapixel "iSight" camera capable of shooting stills and 1080p video and a front-mounted 1.2 megapixel "FaceTime HD" camera capable of shooting stills and 720p video, dual-band 802.11a/b/g/n Wi-Fi with MIMO capability and Bluetooth 4.0, as well as dual microphones and speakers. Connectivity to computers, if desired, and power is provided by the Lightning port.
The battery life of this iPad mini (2nd Gen) model is reportedly 10 hours "surfing the web on Wi-Fi, watching video, or listening to music."
This Wi-Fi Only model (A1489) does not support 4G LTE connectivity or A-GPS.