The last corporate partnership (i.e. product placement) in a SimCity game was with British Petroleum in SimCity Societies, which was before the Gulf oil spill. You can see the BP logo here, standing out from the rest of the city’s simlish signage.
Since then, BP isn’t really a great way to express consumer friendly green sentiments. So Electronic Arts has sold your eyeballs to Nissan instead. Now Nissan billboards appear around your city, just like Nissan ads appear in Origin. If you click on them, you can download a special Nissan electric car recharging station which spreads happiness. It’s basically just a park. For cars. A car park. Cute.
Frankly, I’d rather have McDonald’s logos, like in The Sims.