On the Canon site it does say that it is USB2. However, like I said before, Canon told me that they have replaced "USB" with "USB2" (even though it is one and the same). The USB2 standard (the one that is the high speed standard), they have called "USB2-Hi-Speed". Therefore, if you buy a "USB2" scanner, you are in essence buying a normal "USB" scanner and not a "USB2-Hi-Speed."
They said, and I quote, the following about the Canon LiDE 20 scanner:
"Please be advised that USB2 is the equivalent to USB1.1. USB2 Hi-Speed is the new faster specification for USB. Your scanner is USB2 not USB2 Hi-Speed therefore scan speeds will remain the same."