I am looking forward for controller either, except that I am afraid that my current Mikrotik infrastructure*) won’t be upgradable to the version I may need 
I’m starting to take the “controller promise” for a little dirty business trick to
a) attract people so they keep buying Mk
b) when WLAN controller is released, they have to replace the whole infrastructure or upgrade a mass of licenses.
That’s why I am considering move to Ubiquiti
Maybe I am too suspicious? Maybe it is all just behind the corner?
*) almost 100 units upgradable just to to version 6, purchased with foolish idea that in 2013 the controller must come in just months