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. As a reminder, Gingerbread is 20 months old now, and there's really no reason for it to still be so prevalent when ICS has had over half a year to build.