Apparently, Zynga is looking for an Android game developer, which means that Zynga wants to start porting their massively popular games to Android. This is not such a big surprise considering Google invested 100 million in Zynga back in spring this year, and Zynga is already working on bringing their games to the Chrome WebStore.
But of course that can't be the only reason. Android is growing so fast, it's becoming obvious for every developer out there that they need to focus at least as much on Android as they do on iOS, otherwise they risk becoming irrelevant later on when their competitors become entrenched on this platform.
So far Android has lacked quality games for different reasons, including lack of power GPU's and low amounts of internal storage on Android phones. But now the powerful GPU's are coming together with dual core CPU's, as well as larger internal storage's, a more polished OS and hopefully more polished UI elements for developers to use, in-app purchases, and of course the rise in popularity of Android.
All these should give developers no excuse when it comes to making quality games for Android.