The upgrade is free to existing 3G Motorola XOOM customers and will require owners to ship in their devices to Motorola for the LTE component to be installed. You will only be eligible for the upgrade once you get an email with the upgrade directions. Within a couple of days after receiving the email you will also receive a package containing a step-by-step guide and a FedEx box with prepaid label for shipping your XOOM. The process could wipe out all the data on your device, so it is recommended to backup everything.
Motorola has also promised to unveil two new 4G LTE tablets sometime in the coming months, perhaps after existing XOOM 3G customers have gotten their 4G upgrades. Additionally, the much anticipated and overdue Motorola Droid Bionic is set to launch in September.