"Could they release anything about the secondary outcomes between now and then?"

You can read all about the AHA embargo policy here. Definitely room for interpretation. In my opinion, nothing related to the primary endpoint or pre-specified sub-group comparisons of the primary outcome would be released prior to AHA. Many of the secondary endpoint are intimately related to the primary endpoint; therefore, I would also not expect most of the secondary endpoints to be released prior to AHA. Now, the CKD sub-study and cognition sub-study.....that's a different ball game in my opinion. From my interpretation, results from these sub-studies are completely separate and unrelated to the BETonMACE primary endpoint and most of the secondary endpoints. I think the results of these sub-studies could be announced at any time.

BDAZ