At WinHEC conference session today, Microsoft demonstrated the new Windows Speech Platform capabilities and extensibility for Cortana Extensibility, including information to help hardware and software developers plan to implement Windows Speech Platform functionality into devices on the Windows platform and/or develop speech capable devices. Cortana will be available on all Windows 10 devices ranging from desktops to mobile phones. Microsoft expects developers and OEMs to extend of the capabilities of Cortana in Windows 10. Microsoft listed the following variety of ways in which Cortana can be extended.
Source: Microsoft