I don't think we have to wait till September, yet. Let's get through August first. In May they made separate announcements 10 days apart (12th and 22nd). They just made 2 on Tuesday the 11th.
Will just leave this here...
https://twitter.com/garyblack00/status/1293671118482690050?s=20
Deciding which stock exits the S&P 100 (OEX) could be holding up the announcement of $TSLA ‘s inclusion in the S&P 500. TSLA would go in at #18 just above PYPL. With OXY ($14B, my bet) and SPG ($21B) at the bottom in market cap reporting this Mon 8/10, a decision may be near.