Siri coming to Mac OS X 10.12 this fall, sources say

Sources have informed 9to5Mac that Apple will follow Microsoft's lead and add Siri to Mac, starting this fall with OS X 10.12.

Siri has been tested with OS X internally for at least four years now; it's said that Apple is finally happy with its vision and has a polished interface (see the mockup by Michael Steeber above) nearly ready to go. OS X 10.12 is expected to drop in June, so we can surmise that Apple needs a little extra time to polish the Siri integration.

A couple of other tidbits: a keyboard shortcut for Siri is said to be in place, and the app can be set to run on startup.