Hello,
Which of the Integrated solutions for office supported dual-band WiFi?
In current products - nothing.
You can make your own dualband router - http://forum.mikrotik.com/t/when-cap-with-double-band-with-ac/91571/3
We’re all still waiting, patiently!
Till November, guys.
Do you have a source for this info?
Russian MUM. I’ve seen dual band hAP ac lite and hAP ac in live, Janis and Sergejs said that it’s in sertification state and will be available approximately in November.
They have USB 2.0 interfaces and two wlans in Winbox.
hap_ac_lite.jpg
This dual-band device support Band Steering?
Ive seen it posted in a few places as well to expect a release Q3 / end of summer - cant wait!
They were asking questions about how quickset should work in the announcements forum as well
I don’t expect that the band steering will be implemented.
do you have hap ac (no lite) winbox like this screenshots??
No. I couldn’t connect to it with default login and password, and nobody knows (or wanted to told me) a password. 
By the way, hAP ac have reeeeeeeeeeally long board name (RB***)
Other thing I’ve seen live (and in winbox) is RB3011, and it have 1GB RAM. No screens too, sorry.
How does it look like? Old 2011 or crs fasshion ?
There’s quite much info already on this forum, photos included. 
It’s 2011 predecessor, “outdoor” differences is full-size USB3-port and gigabit ports 6-10 (PoE on port 10 still there).
I could see an mini-PCIe wireless card inside. No other “new” things cought my eye.
Also there are no processor info was in Winbox, only “arm” and 1GB of RAM.
I saw forum photos but I considered that a preliminary unit. Hoping the final device will look better 
Anyway thanks