Cortana, virtual assistant developed by Microsoft, will arrive on iOS is well known for some time, the Redmond company has announced the news in June. An exact date has not yet been announced, but its arrival on the mobile devices Apple seems to be getting closer.
Several hours ago Microsoft published online a registration form (rather complete a short survey) for a limited iOS users who want to test the beta version of Cortana for iOS devices. So this is a private beta but, unfortunately, is currently available only to users in the US and China.
Cortana, at least according to allegations made by Microsoft, will have the role of competitor to Siri (which we allow ourselves to question). The arrival of iOS is intended to provide a better experience for all those users that use an iOS device and a PC Windows 10.(Source Microsoft via The Verge)