The big loser this month was Android 2.3 Gingerbread which is down from 54.2% of the platform chart to 50.8%, but it looks as though Gingerbread will
4.2 part of Jelly Bean will add in an extra 0.8%. And, 0.8% may look like a pretty small number, but given that Android 4.2 was just released about 3 weeks ago, and is only available on 4 devices (Galaxy Nexus, Nexus 4, Nexus 7, and Nexus 10), that's not a bad showing.Even just looking at the Android 4.1 part of Jelly Bean, the version more than doubled its share from 2.7% to 5.9%, and adding in the Android
Although, we're not expecting all that much movement on the Android 4.2 share this month since the Nexus 4 is still showing as either sold out, or shipping in "5 to 6 weeks" in the Google Play Store.
source: Android Developers