The Android L Operating System update for the Nexus 4, 5, 7 and 10 is rumored to arrive in late October.

The latest version of the Android operating system is rumored to launch alongside the upcoming Google Nexus 6. Based on previous releases, Google usually releases two versions of Android OS: one in the summer at the Google I/O event and another in the fall, usually in October alongside a new device from Google.

Android L is reportedly the biggest Android version in history packed with more than 5,000 new Application Programming Interfaces (API). However, this is not finalized and more could be revealed in the final build. Earlier predictions state that the Android L will be released with the Nexus 6 and/or Nexus 8. Last year, Google released the Android 4.4 KitKat  in late November. This year, the new OS is expected to roll out Over-The-Air in the October to November time frame.

The new Android L is reported to have an improved general user interface. Google's Android team presented its new design language at the company's I/O Developers' Conference last month. The design language is called
"Material Design," which boasts a flat interface.

Material Design has appeared in the Chrome Beta version of Android, which is now available for download in the Play Store. Aside from the "Material Design" update, the change log includes simplified sign-in as well as bug fixes and performance improvements.

Google confirmed that the upcoming official version of the Android L will incorporate a multi-user support feature. The feature first appeared in tablets as part of the Android 4.2 Jelly Bean OS, but the multi-user mode is not configurable and has an impact on the device's performance. However, the feature was reportedly improved upon the release of 4.3 version of Jelly Bean OS.