Jelly Bean was running 59.1% of Android devices in December
While KitKat had a small .3% boost to 1.4%, the percentage of Android devices with Gingerbread running the show declined by 3%. The two builds of Ice Cream Sandwich, Android 4.0.3 and Android 4.0.4, together accounted for 16.9% of Android models last month.
As time goes on, we should see KitKat's percentage rise as the number of Android models running on Jelly Bean stabilizes and the use of the Ice Cream Sandwich builds decline. The information covers Android devices that visited the Google Play Store over a 7-day period that ended January 8th.