I, for one am impressed with the playtesters WOTC selected, as I have seen no large amounts of rules posted anywhere or even discussed in detail.
But to the OP, why would the rules playtested need to be the rules printed? And why would WOTC restrict itself to using only playtested rules?
Yes, ina perfect world, it might be best to use material playtested. But what if each and every group of playtesters had totally different advice? Should WOTC then print one version of the rules for each playtest group? I do not htink so. Playtest is suggestions, not commandments engraved on stone tablets.