ASUS's Best Buy exclusive RT-AC1900P Dual-band Wireless-AC1900 Gigabit Router is not a great leap forward from the RT-AC68U.
TP-LINK's AC1200 Wireless Dual Band Gigabit Router Archer C5 V2 is a very different router than the original.
D-Link's DIR-895L/R AC5300 Ultra Wi-Fi Router is late to the AC5300 party, yet still doesn't have working MU-MIMO.
Updated - TP-LINK's AC3150 Wireless MU-MIMO Gigabit Router provides no practical benefit over its less expensive AC2600 cousins.
Arris' SBX-AC1200P SURFboard Wireless Network Extender with RipCurrent is a nice little powerline-connected Wi-Fi extender, but trapped in a G.hn world.
Arris' SBR-AC1900P SURFboard Wi-Fi Router with RipCurrent G.hn Technology combines a conventional AC1900 class design with an underdog powerline networking technology.
TP-LINK's Archer C3150 was announced at CES 2016.
Synology's RT1900ac Router has a lot of nice features, but poor wireless performance.
Monoprice's 12288 earns a #1 powerline adapter rank. But it might not be the right choice for you.