Jelly Bean Officially Lands on the US WiFi Xoom
Google is currently in the process of rolling out Android 4.1.1 Jelly Bean to various Google Experience Devices. It has already been made available for the Galaxy Nexus, and later the Nexus S. The update is now heading towards the US WiFi version of Motorola Xoom (Wingray). If you own the first Google-supported Android tablet and want to get Jelly Bean up and running on it, wait no more!
While you can wait for your table to receive the update, many prefer to install the update manually. To manually install the update, you must currently be running the official Android 4.0.4 Ice Cream Sandwich IMM76 firmware, as the OTA is an incremental update. That said, pre-rooted full ROM packages should start appearing soon in the Motorola Xoom forum.
You must have a USB host cable in order to flash the update manually. This is because the file has to be renamed to update.zip, placed on a USB stick or (or memory card inserted into a USB card reader), connected to the device via the USB host cable, and flashed from the stock recovery.
Update: There is another, much larger thread that was posted earlier and has more active discussion going on about the update so you might want to check it out if you run into any problems.