The overwhelming majority, almost 65%, run on Gingerbread.

BBC: Google announces Jelly Bean Android system upgrades

Amazon announced that the Fire would run on the Android Gingerbread operating system.

FORBES: The Amazon Kindle Fire May Kill The RIM Playbook

The creation of the new naming system is marked by the release of four new GALAXY smartphone, the GALAXY W, GALAXY M Pro, GALAXY Y and GALAXY Y Pro, all of which run on the powerful Android 2.3 Gingerbread operating systems.

ENGADGET: Samsung debuts new Galaxy lineup, refines naming strategy along the way