US only, for Android devices only at the moment but with the intention of taking this to other markets.

“The Cortana app can do most of the things Cortana does on your PC or on a Windows phone,” said Micro's Susan Hendrich

http://blogs.windows.com/bloggingwindows/2015/08/24/cortana-now-available-on-android-in-public-beta/

“With the app, you can manage your hectic lifestyle by setting and getting reminders, searching the web on-the-go, tracking important information such as flight details as well as starting and completing tasks across all of your devices.”She continues.

http://indianexpress.com/article/technology/tech-news-technology/microsofts-cortana-assistant-launched-on-android-but-only-for-us-users/

Skynet is coming online.

Neh, it doesn't say Oni-chan or Senpai so I will skip

Was about to install it but then read a two page permission slip on how Cortana wants super user access to your phone and have access to all of your files and browsing history. That's like always worrying about your mother finding something in your room that you shouldn't be having. Pass!!!

I do love how Cortana calls me 'Sex Master' on my clean Windows Phone though. 😘

Actually it does. Set your name to Oni-chan and pronounce as "own e chan"

I'll wait for mods too.

I rather have her say Onii-chan though, I'm don't like yotsugi that much.