Windows Phone 8.1's Cortana Is Google Now Plus SiriSEXPANDGo
Just like leaks suggested, Cortana also comes with her own "notebook" which lets you teach Cortana things and where she stores things she's learned about you. Anything from interests she has picked up from search queries, people who you call a lot, locations you frequent, and other contextual information.
This is also where you can set certain people or things as off-limits from her electronic gaze. You can also use the Notebook to set up things like quiet hours, and specific contacts that are allowed to bust through your wall of silence.
Of course Cortana isn't the only thing that's new in Windows Phone 8.1. The next update to the OS will also bring along a notification center with actionable notificiations, another feature that helps bring Windows Phone up to par with Android and iOS.
Windows Phone 8.1's Cortana Is Google Now Plus SiriSEXPAND
Windows Phone 8.1 also includes a handy features called Wi-Fi sense which can automatically log you into to safe Wi-Fi networks of your choosing, and even can let you share you own personal password protected Wi-Fi with friends who visit your pad, without having to tell them the password out loud.
Windows 8.1 will start rolling out to consumers sometime "in the next few months" and will start shipping on new phones sometime in late April or early May.
Windows Phone 8.1's Cortana Is Google Now Plus Siri