So you posted this again? They never gave a solid date for September, just "mid-September". Recently, at TGS, they gave mid-October. The reasons could be as simple as 'defuse anti-Legacy backlash' to as complex as 'server work to ease congestion had unforeseen impact on server interconnectivity'. We don't know, nor are we entitled to know. Just sit back, watch the site for when it's announced as implemented.