Android versions 2.1 and earlier have dropped off the charts, but the latest Jelly Bean hasn't arrived yet

The latest stats from Google show that Android "Jelly Bean" continues to gain ground as the most popular version of the platform, but the very latest releases of Google's smartphone OS continue to face slow adoption.
Jelly Bean is a bit unusual as Android codenames go, because Android versions 4.1, 4.2, and 4.3 all bear that moniker. Other point-releases have all been given separate codenames.