It's only about the software and that's what will take a lot of time for Mikrotik to get working, lagging behind competition probably by 1-2 years.
Hardware wise, Qualcomm/Atheros provides reference design boards, some APs are just that in a custom box, for example: https://wikidevi.com/wiki/Compex_HK01
Just look at these specs... it completely blows RB4011 out of water, with wired 10GbE, SFP+, USB 3.0, extra miniPCI slots (not occupied by wireless).
Get ROS running on a board like this and it will be killer product.
But so far we can only dream... not a single word about 802.11ax from Mikrotik...