sfx2000
Part of the Furniture
The OS / Kernel is 64bit like previously discussed, but ARM architecture / instructions curiously still ARMv7-a, this should be changed to ARMv8.
Aarch64 can run pretty much any 32 bit ARM code - there's a cost to doing it, but it can/does run... which with the 3rd party stuff, that's ok...
Looks like the RT-AC86U is going to be in the same SDK -- so folks do need to get started getting up to speed with this drop...
http://www.asussmart.com/smart/556.html
BTW - what's up with Mediafire and the nasty/scammy popups there :|