The first video runs through the tutorial city and kind of give you a quick run down on how everything works. The second video shows off the road system. Not only can you create your standard straight roads, they've incorporated curved and circle roads. If that isn't enough for you, just draw your own roads!
Check out this video on Facebook that is showing someone starting a city from scratch. It's awesome to see how simple they've made setting up zones for everything. These videos have just made me more eager to play the game!