So I just started a city in the new region and I'm working in sandbox mode on my road layout. I didn't notice this until I launched the game a day after laying down this road. In the screen shot you can see a couple industrial buildings that seem fine and actually were under construction while under water. cars pass on the road like normal and I guess I'm going to leave it since there's no terrain tools. just thought it looked weird so I'd share. Also I've noticed since 4.0 while i'm draggig zoning tools around they leave remnants that look like I've laid down the zone, they disappear when I click off the zoning tool.
in this screen shot there's a car under water and a car coming up the hill that just left the water. It's pretty cool to watch the tides go up and down on the buildings.
Here's another one showing off my awesome train bridge with the sun reflecting the sink hole on the right