sfx2000
Part of the Furniture
The freescale reference board looks interesting, Where can it be bought from and how much?. Another thing interesting about speeds between 1G and 10G is that usb3 is 5G which will comfortably support a 2.5G full duplex NIC. The ASUS AC5300 may claim 5Gb/s of wifi throughput but practically i would expect at most 2Gb/s which would require some LAGG so if they're going to release it with the usual 4 switched gigabit ethernet ports and 1 gigabit ethernet WAN it will be a very dumb thing to do if it is marketed as a router instead of AP since there isnt enough ports to properly utilise it.
My best guess - based on previous experience - you can't just buy the reference board - normally they're part of an OEM agreement with a BSP (low level) and SDK (suitable for production with a basic skinable UI) for SW, and BOM/Gerbers so that one can build more...
Sometimes you can find them... even if this were available, it's likely thru a specific reseller, and my best guess is that it would be between 1000 to 1500 dollars...