Microsoft has released new iPad and Android apps for Dynamics NAV 2015:

Microsoft describes the apps as the “perfect companion for service engineers, sales field organizations, executives and decision-makers, or anyone in your organization who wants access to Dynamics NAV from a touch enabled mobile device”.
Listed features include:
Get an overview of your business in the Role Center.
Tap and swipe to get to your data and drill down into details.
Search across all columns in a list.
Send lists to Microsoft Excel or Office 365.
Shoot pictures using the camera on your mobile device and upload them to Dynamics NAV.
Rotate your device to get an overview of your data or focus on content.
You can preview the iPad app here, and the Android app here.