Tim,
iOS 9 is fine, really doesn't seem like anything changed. Tested ActiveSync, CalDAV, CardDAV, and no issues.
For OSX 10.11, Seems like it's just AutoDiscover for EWS and CardDAV with issues. Both I'm thinking are probably beta problems as I can't even tab between inputs on CardDAV. CalDAV is fine, and they have added an advanced setup, so it's actually pretty easy to just quickly setup the account.
AutoDiscover through SRV does work with Exchange 2013, so I'm thinking they might have done something with the XML request processing, I could probably wireshark things if you need it.
If you guys want me to troubleshoot anything, just drop me an email.
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