At the annual I/O Conference on Wednesday, Google unveiled its newest mobile operating system dubbed Android 4.1 Jelly Bean. The OTA update will roll out for Samsung Galaxy Nexus in July. In case you do not want to wait more, folks at RootzWiki have leaked the OS for Galaxy Nexus smartphone.

RootzWiki picked up the early Android 4.1 Jelly Bean build that Google handed to I/O Conference attendees on Wednesday. Applying the concept of reengineering, RootzWiki developer jdkoreclipse made available Android 4.1 Jelly Bean for Samsung Galaxy Nexus smartphone, making it the first device available in the market to run Android 4.1 Jelly Bean.

At first, the unofficial Jelly Bean update was made available for HSPA+ variant of Galaxy Nexus. After doing some homework, RootzWiki extended functionality of Android 4.1 build to Verizon Galaxy Nexus by removing connectivity bugs.

It is to be noted that Google Nexus 7 is the first Android device (actually a tablet) to run Android 4.1. However, it is hitting market in mid-July, which makes Galaxy Nexus the first device available in the market to run the latest version of Google mobile operating system. The official Android 4.1 update for Galaxy Nexus is scheduled to roll out shortly after Google Nexus 7 tablet hits market. In addition, Google has confirmed update for Galaxy Nexus S and Motorola Xoom tablet.

The new version of Android operating system in not groundbreaking, However, Android 4.1 Jelly Bean brings a number of new features to Galaxy Nexus smartphone including Google Now, offline voice dictation, revamped notification bar and performance improvements. Comparing Android 4.1 Bean with Android 4.0 Ice Cream Sandwich, Galaxy Nexus running the former version appears to be faster with quick responsiveness.

The leaked build for GSM International version of Samsung Galaxy Nexus is available for downloads from RootzWiki. Verizon Galaxy Nexus owner can find the Android 4.1 build here.

Installing a leaked firmware, you should know that the process requires root access to Android operating system and rooting voids any warranty provided by the device manufacturer or network carrier.