Apologies if this is old news but I found this link and thought it was pretty interesting:
http://qenusasupportforums.motorola....ostID=10127640
It's someone quoting a Sprint rep regarding an upgrade to WM6. Here's the relevant passages:
"I understand your inquiry regarding upgrade for Moto Q
Currently, we are working to launch the Windows Mobile 6 upgrade for Moto Q. Although, no official release date has been declared for the upgrade. However, as soon as the upgrade is launched, we will inform our customers with high profile promotions.
I understand that there are lot of customers waiting for the release and I can assure you that our technical department is working hard to make it available soon. I appreciate your patience and understanding in this regard."
If this is accurate, I would presume other carriers would do the same.