These new apps replaces the OWA for iPhone/iPad/Android apps.
Note it was publically announced, but not in this blog, that Windows Phone 10 will be getting a similar app.
Here is the announcements - http://blogs.office.com/2015/01/29/deeper-look-outlook-ios-android/
Additionally there was an even more recent announcement for more features being added located here - http://blogs.office.com/2015/02/17/pin-lock-updates-outlook-ios-android/. This is a good read as it discussed:
- Expanded support for PIN lock – discusses that policy is enforced through Exchange ActiveSync and considerations for that policy.
- Improvement with remote wipe of data – the nice thing about this is the wipe on wipes data in the Outlook App, it does not impact user personal data if BYOD is part of the enterprise strategy.
- Along with several other new user experiences that have been added.
- Additionally there is discussion around Microsoft Intune scenarios are being added.