We kind of expected to see additional evidence of an upcoming Wii price drop if it's true, but now we have conflicting evidence. While rumors currently have the system dropping to $149.99 on May 15, images posted on GenGame show what appear to be an internal Target communication about the price changing to $169.99 this Monday.
The Target information refers to "Black Wii Console with Motion Plus Controller," which could either be a semi-accurate description of the most recent Wii hardware configuration (which includes a Wii Remote Plus), or a previous iteration which came with Wii Sports Resort, a Wii Remote, and a MotionPlus add-on.
If it's the latter (and these images are real), then this is a clearance of outdated hardware; if it's the former, it's a likely signal of a manufacturer price drop. In either case, it means the possibility of cheaper Wii hardware.