Linksys' EA9300 Max-Stream AC4000 Tri-Band Wi-Fi Router tries to spiff up the 3x3 "tri-band" router market with higher link rates, MU-MIMO and a much more powerful CPU.
ASUS' GT-AC5300 Wireless-AC5300 Tri-Band Gigabit Router is a slightly beefed-up version of its RT-AC5300 predecessor.
Updated - NETGEAR's R7000P Nighthawk Smart WiFi Router with MU-MIMO is the company's attempt to lure you away from the Nighthawk that started it all.
ASUS's Best Buy exclusive RT-AC1900P Dual-band Wireless-AC1900 Gigabit Router is not a great leap forward from the RT-AC68U.
Edimax' Gemini RE11 AC1200 Dual-Band Home Wi-Fi Roaming Kit takes a different, and cheaper, approach to building a mesh wireless network.
Linksys' WRT3200ACM AC3200 MU-MIMO Gigabit Wi-Fi Router is another example of a router with technology waiting for devices to catch up with it.