Sprint Motorola Q9C can now upgrade their devices to Windows Mobile 6.1. Motorola has released the update much earlier than had been expected and it is now available at the Motorola software update page.
Hopefully this means that other Motorola users will soon see the upgrade as well.
Note: The update will replace the current ROM image and will erase partnership and all user data and programs on your device. Be sure to back everything up before you start.