Yeah don't worry it's coming. They totally plan on releasing updates for the MiBox. It's definitely coming. Please buy one. Promise they'll update it.

No. Will it have in the future? May be!

It will come soon^TM

I've sideloaded the apk since two months or so and its working really good. There are some tweaks but other than that its very usefull.

No

I believe the update to N has it.

No and I hope it will never have it (at least in my country the assistant does less than it was able to do before... but at least can say funny jokes)

Yes it has.