the Corporation has Recently updated the interface Cortana to Android, but to stop there is not going to. In the future we plan to more deeply integrate their virtual assistant in a competing mobile OS.
In particular, the company is currently testing the ability to access Cortana directly from the Android lock screen. This feature appeared in the new version of the application. After installation the app will ask to activate Cortana on the lock screen. Then in the bottom of the screen appears the logo Cortana and the user will be able to challenge a virtual assistant with a regular swipe to the left or right. And from the panel you can view Cortana notifications or to make a request.
However, it is noted that with this method call do not have to unlock the smartphone. Thus, theoretically, any background will be able to access user data without unlocking the device. Perhaps in the future Microsoft will improve the security aspects. Embedded on the lock screen the call Cortana will not replace an existing screen that can be used in conjunction with it.