Panasonic has developed a 20″ 4K prototype tablet running Windows 8 Pro, and we checked it out at CES 2013 where the Japanese company had one on display. The complete list of specs were revealed, but are subject to change: a 20-inch IPS Alpha 10-point multitouch display with Ultra HD 4K 3840×2560 resolution and 15:10 aspect ratio, an Intel Corei5 3427U vPro 1.8Ghz processor, NVIDIA GeForce Graphics, 4GB of RAM (up to 16GB), 128GB SSD, high resolution Anoto live digital pen input, Bluetooth, WiFi, USB port, microSD card slot, and a 720p front-facing camera. The massive tablet gets about 2 hours of battery life when it’s not plugged into an outlet. Pricing and availability are unknown at this point, as it’s still a prototype, but it’s apparently geared for businesses and marketing solutions. [Direct YouTube Link]