Engadget is reporting Android 4.4 is now on 1.1% of devices with jellybean 4.3 on around 50% plus.

But these figures shown above in the chart are slightly misleading as earlier android 1.x devices are not shown as they cannot connect to the Play Store. Android 4.3 and above is still showing greater adoption figures but if you did include all the 1.x devices the numbers would be different.