Android 4 is old. At least in name. The original 4.0 release actually came out back in 2011, and ever since Google has released incremental 'point' releases which may have added features, but haven't added a lot of excitement.
Now it looks like things are about to change. The rumours are building that Google might be readying Android 5, the biggest update in years.
So when will it come? If it is this year, then it's likely Google will unveil it at I/O in the early summer. Rumours suggest it will be shown first to developers and released in beta alongside some new Nexus (or Google Edition) devices, followed by a traditionally gradual rollout via manufacturers.
As to what it will be? Well, that's trickier. That said, we might have just had our first good look at the new version. Android Police posted a set of screenshots supposedly showing the new icons and background.
Codenamed 'Moonshine' the update looks like a big visual refresh, and will also bring some great new features including integration with Android Wear smartwatches and other wearable tech.
Take a look at the video to get a sense of where Android is going - and why you might want to choose a Nexus 5, which will get the update first, over one of the other great Android phones on the market.