SimCity Mac will not go full screen

Indeed. Of course EA can say "Os X 10.9 is not released yet", but it will in less than a month, and they should have tested before since the DP has been available for several months. I wonder if the game will work when Os X 10.9 will be officially released (in less than a month).

Having the same issue, though I finally got Simcity to launch with -w  - of course, you have to play in a window afterwards, but you can change the graphics options and make it almost as big as your screen.

Not great, but hey, at least I can play now 🙂

On SimCity 4 Deluxe Edition I can change screen size by clicking on the gear beside the "Launch Game" button. It gives me the option of "Fullscreen" or "Play in Window"  Hope this helps. 

for me it won't come of fullscreen

There have been so few Apple PC users answering anything here, your odds of actually finding a peer of your own are very low.  Your fellow Apple players just won't stay around, so the official support is the only way for you to go:

https://help.ea.com/