if it's for a shot you can rehearse, then get the actors to go through the shot and put marks on the focus ring of where you need focus to be and then have someone turn the focus at the right times.
Otherwise you can try and use focusing assist if your camera has it. ie: where red lines appear in the camera screen of what's in focus. The sony a7 cameras have it, the cannon dslr's you have to use magic lantern to get it.
Wish it was in my a7s..
I'm a bit concerned about what the rolling shutter will be like.
I'd subscribe, especially if they have there films on there as well, some of my fav films are done by HBO.
Though I often run into the problem on netflix of the film I want isn't available, though it probably is on some other service. I really don't want to have to subscribe to several different video streamers. I get the feeling people will choose one or two and then download films that aren't offered on there.
A bit underwhelming for video...
I can see it having a place for someone shooting stills and a bit of video on the side. Like a wildlife photographer. In some contexts the really good weather sealing would be nice (I wish the a7s had this kind of weather sealing).
Over the last couple of years I've moved from someone who right into canon dslr's to now being far more interested in camera's like the a7s (and even the f7 looks a better camera than the c100 for that style of 'run and gun cinema doco/news' stuff)