More than half of Android devices are powered by Jelly Bean
This past week, Google introduced Android 4.4 KitKat which should start to show up in next month's distribution figures. But Android detractors are going to look at the large number of those still using a phone running Gingerbread and bring up the fragmentation issue that has plagued Android since Froyo days. Android 4.4 is supposed to help eliminate some of the fragmentation by working with some Android models carrying just 512MB of RAM. We will have to wait to see future distribution figures to see how successful this strategy works.
source: AndroidDevelopers via AndroidCentral