If this report is accurate, I sincerely hope Apple also addresses the (scam) services that offer pay-for-ratings deals. As it stands, it seems that changes in the rankings push devs towards a payola type system that essentially requires astroturfing in order to avoid being at a competitive disadvantage. And I don't think that benefits users or the ecosystem - it only benefits devs willing to engage in shady promotional practices at the expense of those who'd rather see ratings reflect the actual quality of the apps in the store.