Using Outlook for Android for personal email and calendar management
Odd, I am finding the same.
The setup experience was different too, I entered my O365 email previously and it went off and then asked for my O365 credentials.
On the older release it just goes straight to credentials and pulls down my avatar instead of showing the Exchange image.
I suspect I can upgrade fine now but will hold off a bit, I only reset my phone completely a few days ago.