Android 5.1 Lollipop is already here, but you can't get it yet
Android 5.0 Lollipop was the only new Android release that came out in 2014. And that was unusual. Prior to its arrival Google had announced twice as many each year (even more, if we look far enough behind), with less than six months between them. In 2015, Google is shaking things up one more time.
In recent years, the first new Android release of the year usually came in June or July, but in 2015 it arrives much sooner. In fact, Android 5.1 Lollipop is already here, as it is shipping on a new batch of Android One devices slated for Indonesia.
Believe it or not, there is not even a formal announcement of Android 5.1 Lollipop at the time of writing this article. As spotted by the folks at Android Police, the only places where you are likely to find references of it are on Google's Android One landing page, and even there little information about it is available.
On it, Google appears to have only replaced Android 5.0 Lollipop with Android 5.1 Lollipop and called it a day. A month ago, Android Pit came out with an unofficial changelog -- and it remains just that, until Google reveals the changes.
The first devices to come with Android 5.1 Lollipop are Evercross One X, Mito Impact and Nexian Journey. If you live outside of Indonesia, it's likely you haven't heard of any of the said brands. (And who could blame you?) You can check out their specs in the screenshot at the top of the page.
Even though Google has yet to reveal Android 5.1 Lollipop plans, it's likely that the latest version of Android will roll out in a reasonable time-frame to compatible Nexus smartphones and tablets. It first has to make its way to AOSP (Android Open Source Project), which used to be among the first places to house the final bits of code.