Microsoft gives you two ways to access Cortana on Android, in her own dedicated app and as part of the Microsoft Launcher. Both methods have pros and cons, but the implementation on the Microsoft Launcher is new, and quite awesome.
There's a discussion taking place on our forums right now about whether its best to simply use Cortana as part of her app, or as part of the Microsoft Launcher. And we'd like your thoughts.
I primarily use Cortana as an app, as she can more directly integrate with Android itself, replacing Google's own assistive features. Over time, though, I can see Cortana for the Microsoft Launcher developing into a system that might replace the separate app. If you only use Cortana lightly, it might be more efficient for you to use her as part of the Microsoft Launcher only.
But what do you think? Let us know in our forums.