A nice and interesting stream. The hour went by very fast. Some interesting details was showed and the game already looks better than SimCity 2013 and Cities XL ever did.
Generally I think they should add more zones though. They didn't show much about zone control in the stream. But it didn't look so flexible. Medium density zones should definitely be considered.
What if I don't want my buildings to evolve? What if I want a neighbourhood to stay at, for example, level three? What if I want a neighbourhood to stay uneducated/poor/working class but still want to offer them all of the available services? Can I stop houses from evolving? Can I limit a street to only rich houses?
So basically: More zone control than what was showed in the video would be great.
I also think the zones where too large sometimes. Can we increase density by not allowing zones to go so far out from the road? I think they went four squares from the road and it seemed to be standard. Can I zone it so that it only goes two squares from the road?
Hm... This looks like a rant. It's not.

Just some thoughts and concerns after watching the stream.
I remembered about an important question.
Will be possible to build adjacent buildings? I mean, connected buildings... It would be important to have a realistic density.
Wall-to-wall in other words. I think they said earlier it won't be in for release. Hopefully it will be added later. One of the most important features. If they make wall-to-wall as a dedicated zone they could lock it to only be possible to zone along straight roads and therefore solve at least some of the design problems. I really hope that they will be able to include it as soon as possible. We won't be able to build realistical European cities without it.