November Android numbers show KitKat up to 30%10
2.3 Gingerbread dropped from 11.4% to 9.8%; Ice Cream Sandwich was down from 9.6% to 8.5%; and, Jelly Bean went from 53.8% to 50.9%.All other versions of Android saw declines for October. Android
It should be interesting to see how Android 5.0 Lollipop premiers next month. If Google can push the update to all the scheduled Nexus devices before the measurements are done for December, it could have a relatively strong showing for an Android update. When KitKat first launched, it only captured 1.1% of the market in its first month.
source: Android Developers