Microsoft has published a whitepaper demonstrating how to configure an environment so that users can connect to AX 2012 using mobile application
Some of the pre-requisites required for this to work are:
a. Active Directory Federation Services
b. Azure Services
c. Dynamics Ax Mobile Connector
The setup seems to be an interesting one, When I get some time, I definitely will have a go at it. Keep watching this space for more updates.
Happy Daxing :)