Google has made its monthly update to the developer dashboard with new platform distribution numbers, and KitKat is on a roll (finally). After making up only 2.5% of active Android devices last month, it's now at 5.3%. Yes, it more than doubled. Those continued Samsung updates probably have a lot to do with the jump.
Google has again updated the current platform version numbers, and they show a reasonably good uptick in the usage of Android 4.0 variants. However, Google's new baby, Jelly Bean, is still bumping along at less than 1% even with all those Nexus 7 tablets.
Last time Android 4.0 was almost 11%, so those new devices and updates are definitely helping. Gingerbread was, and still is the majority of devices, but it's dropped a few points from roughly 64% to a touch over 60% now.