When I bought FIFA, it was just labeled for Mac. After installing origin I has acess to the PC version. I expect SimCity will be the same way.
At any rate I have a screenshot of an EA rep telling me so, so hopefully I will have recourse if it happens to not be the case.
sorry but a screen shot won't help you in any way. if EA does decide to charge separately for mac, they will simply tell you that the rep was misinformed.