Tom and Luis told me that RIM has started to do something new with Desktop Manager. It used to be that you would have to update the whole Desktop Manager install every time RIM released an update. Recently both Luis and Tom were prompted to update the Device Switch Wizard in Desktop Manager when they tried to switch devices. As far as I can tell this is a first for RIM to force an update of a specific component.
The weirdest part is that people are not getting this update when Desktop Manager starts and checks for updates. It only shows up if you try to do a device switch.
Let us know if you are getting the same popup!