Yesterday copies of Cities Skylines were sent out to the press and streamers with an embargo which has been lifted today for video and discussion (not reviews).
Due to this there are lots of videos/streams that have appeared throughout the day so if you want to watch it being played just look it up on Twitch for streams that are active. Youtubers are also geting in on the action and you can start working your way through those videos via this link. IncGamers has also posted part 1 in a series today.
If you are sitting on the fence still on whether to pre-order or not, pay attention to the actual details, don’t get sucked in by over enthusiasm of streamers who have a tendency to make things sound more exciting than they really are just to keep viewers watching,