Ann: Admission to the S&P/ASX 100 and S&P/NZX 10 Indices, page-188

Most likely A2M were included separate to the quarterly rebalance notice. The thing is, A2M are already in the 100. Under normal circumstances that would not have occurred until tomorrow. For example if you check the 200 list, neither WTC, PLS or LYC show up, and won't until tomorrow. Yet A2M does show up in the 100 list.

Now the only way that could happen is if A2M were included prior to the quarterly rebalance notice going out, which is why there was no mention in the asx release.

So here's what's happened, and I'm pretty sure this is all correct. TTS were removed from the 100 and 200 as part of the arrangement with TAH. DHG replaced TTS in the 200, so this now left a situation where there was 99 in the asx100, and a further 101 in the asx200, making up 200 constituents. A2M was then promoted from the asx200 into the asx100, making the balance 100/100 again. However S&P released announcements for all of this, except the A2M part.
Then the retail side has sat around waiting for the quarterly announcement, which showed no change, which was correct, because it had already happened.
S&P don't always release weighting changes through the ASX other than the main quarterly notices, they aren't actually required to. However they do normally keep the retail side updated through their own media releases, so from what I can see, that is the only thing that has failed.

Cheers