For those who are curious to see how far Ice Cream Sandwich has progressed in adoption rate on Android phones, (or for those who just love charts), you can see a full Android distribution breakdown in the chart above. Ice Cream Sandwich has grown to almost 11% since it was introduced last October, while Gingerbread hits about 64%. Interestingly, Google's newest OS, Android 4.1/Jelly Bean is absent from this list. It's not really surprising really as this chart was probably compiled just prior to the launch of the only device to sport Jelly Bean, the Nexus 7.
If you want to see more data, or really do just love charts, check out the source link below from the Android developers.
Source: Android Developers