Asus AC2400 RT-AC87U Dual-band Wireless Gigabit Router
http://www.cnet.com/products/asus-ac2400-rt-ac87u-dual-band-wireless-gigabit-router/
Was just watching the review earlier, and reportedly you can put a 3g of 4g dongle into one of its 2 USB ports. Serious piece of hardware with a $280 price tag to match.