Pentax K7 final version will have a modified sensor

"Amateur Photographer (AP) has delayed its review of the Pentax K7 digital SLR after learning that the final version will include a modified imaging sensor."

There must be a reason for this last moment modification and every pre-production Pentax K7 review should be "voided" at that point. I cannot recall another company making such a drastic change in the last moment.