Mike -- are you still seeing a broken OTA link in shared emails? I just confirmed that the issue remains fixed. There is a seven day timeout on those links, so if you wait for more than a week you'll have to re-share the link.
Mike -- I just did a bunch of builds for iOS, trying to debug an issue, and every OTA link worked perfectly. Sometimes installs on an iOS device fail if you still have a previous version of the app installed. In that case it works better to remove the existing app first and then try the OTA install.