Google has unexpectedly released its latest major update to Android — foregoing the usual ceremonious unveiling — to all versions of its own Pixel phone. Users of the Pixel or Pixel 2 (or their respective XL versions), can download it now to get new features including AI-optimised battery life, apps that predict what you want to do next, new security and privacy measures, a new optional gesture-based navigation system and more.

As ever, the update will roll out to other Android devices as their respective manufacturers make it available.

The release not only breaks with tradition by launching so suddenly, it also has a much simpler name than previous versions: Android 9 Pie (not 9.0, as the style has been previously).

Though major iterations are always nicknamed after sweet treats, this is the least specific one since 1.6 Donut. Previous versions have included 8.0 Oreo, 7.0 Nougat, 6.0 Marshmallow, 5.0 Lolllipop, 4.4 KitKat, 4.1 Jelly Bean and 4.0 Ice Cream Sandwich.

Aside from a system-wide visual redesign, the biggest change in Pie is an optional one: a new gesture system that removes the traditional trio of Android navigation buttons.