Available now! Cisco Catalyst Multigigabit Switching - Cisco
I really hate this marketing crap that you need mGig ports to support 802.11ac wave 2 APs.
No one at Cisco has been able to show where in "real world" testing anyone has been able to actually push an 802.11ac Wave 2 AP past 1G.
Given that you need 80 or 160 MHz channels, an SNR and RSSI that pretty much puts the client on top of the AP, no external interferes (wifi or non wifi) and a wireless adapter tuned to the AP achieving more than 1G is ridiculously unrealistic.
Really good reference about this
Now don't get me wrong, I see great uses for mGig ports for wired devices requiring more than 1G where upgrading cabling is not an option (and have deployed for this reason), and when 802.11ax comes out that's when they will be utilized but i really wish Cisco would stop with marketing speak that says you need something to solve a problem that doesn't exist.