Apparently it isn't NVIDIA or EA's fault. It's Apple's
Transcript of chat I had with NVIDIA:
Sanjib: Hi, my name is Sanjib. How may I help you?
Katy Humphrey: Hi. I was wondering if NVIDIA were planning to update their drivers as my graphics card is no longer supported by the new MAC OS X
Sanjib: Which graphics card are you using?
Katy Humphrey: 320m
Sanjib: Please be informed that the drivers for Apple computer with NVIDIA geforce chipset are developed by Apple, As you are using the New MAC OS the drivers will be updated soon
Katy Humphrey: Is there an ETA for when the drivers will be updated
Sanjib: I am not sure of that, you need to contact Apple regarding that information.
Katy Humphrey: So once these drivers are updated Sims 3 should work on Lion
Sanjib: Yes, it should run fine.
Katy Humphrey: Are NVIDIA working on this issue?
Sanjib: Yes, we are currently working on this issue
