The Xoom's 4G LTE upgrade will come 90 days after launch and take about 6 days to complete, according to an apparent leaked Verizon document procured by Droid-Life.

Xoom users will have to ship their tablets to Motorola to receive the upgrade, but they won't have to change their plan to take advantage of 4G. The upgrade will only be available for 6 months after it starts and will be free, including shipping and handling. [Droid-Life via Engadget]