The same blogger who posts the first day sell-through, post leaks some hours before the numbers come out. The problem is that he likes puzzles, and you have to guess what is saying.
Maybe he is doing this to avoid problems with Media Create for leaking the numbers.
I doubt Media Create is as "paranoid" as NPD, but I doubt they're too happy about people leaking data some people pay for. Better safe (and puzzled) than sorry, I guess, ha ha.