[Update 01/07/2014 14:00 clock] Asus named after publication of the report more details about the RT-AC87U: The router works with two processors, a BCM4709 (ARM Cortex-A9 dual-core 1 GHz) and the unspecified CPU core in QSR1000. As with the RT-AC68U (see test in c't issue 23/13) there is a USB 3.0 and a USB 2.0 port. DFS support needs to be delivered shortly after the release via firmware update. Asus wants to bring the RT AC87U in the third quarter of 2014 for 210 euros on the market.
http://www.heise.de/newsticker/meldung/WLAN-mit-1700-MBit-s-2076151.html
http://www.heise.de/newsticker/meldung/WLAN-mit-1700-MBit-s-2076151.html